Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b36df4e6368861…

MALICIOUS

PDF

79.7 KB Created: 2021-07-19 19:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 193263450bb10643cedfc6344afefe22 SHA-1: 37fddf18b36d5b0c2036fb313b9907678922693f SHA-256: 51b36df4e63688616c714acd17d6563a167c740373a0ea1064803218a5acb29f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://accessiblevehicleservices.com/userfiles/file/dinojevexifemiwuximifaxa.pdf In PDF document text
    • https://defrokatilai.lt/images/files/dabajatomutipovujez.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/mofumavojedalifoxav.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44dd8addd---vuzali.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/73390990705.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixunapiguv.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/20856473636.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bilulipo.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ccf6a00d0---86356856507.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/85922788939.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fekikaketuk.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799593d315c---95290466182.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/miigk1rdcqcd0i5d3mft25qqnp/7827572588.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/88213647451.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/34178023271.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/gubemutudurizufexovevosa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf36bef86---60897741620.pdfIn PDF document text
    • https://goodline.by/userfiles/file/80394315729.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9548d9b6e0---jazoradunuvetafuwab.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/180fdf273bb56215c786833caf633354/55638441254.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/oka2b7d40q8a545rgsm3a6o3bv/sevafilafaxiz.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087aec76e49d---datisojetiziri.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8cd2b49ee505b0bdc65a31e993d4e49c/kipejexume.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/cd72bf0fdda7ffbfab50d54f20887847/lovesemevusizadisi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f260934ffe8078d277693602c2d84030/towiwigevufaguxom.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba0624566---xewenokemedaw.pdfPDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089847e46810---bigajuvawoxotaxomi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972aad04618---87610954979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cute+song+lyrics+to+send+to+your+crushPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16812 bytes
SHA-256: 6b0836334ef3d70bce63376056b060352548a0301d26c5fb3a419ad2572bb3d9
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 10732 bytes
SHA-256: 31d9919e7292e78cb11c483052c3680e7475099a6630054af9291d5f16bf0d08
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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