Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7830e449cdf9b0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 11:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bff0271f26473f0296234c973f4b664 SHA-1: 3237ef42f0f985b650e2c2bb9e70e7a4130d7740 SHA-256: 1d7830e449cdf9b067b95bcc2c568dd78ff268b483e1a19bf1003a1d664f36cc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pololanna.com/user_img/files/11069982839.pdf In PDF document text
    • https://lensmam.com/userfiles/file/85796487663.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lazasisoxini.pdfIn PDF document text
    • http://atek-ent.com/upload/file/gowefasibade.pdfIn PDF document text
    • http://philipsphotographystudio.com/pofipepolinitokoxedupuvu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tiwagekokoxinikeditozasuk.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50c980e15cc93369fdb95512bd5da967/nomefagizawuwovusefevipej.pdfIn PDF document text
    • http://zerosquareonline.com/file/gitijokedafiwava.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/womunalavilegogojiful.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/pavakudebapadewuluxope.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7lbqepidt0rq8rp3gaqpe7cmq5/sojagumavigojovuveferiw.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/rifavajupekuwebidewiban.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a727078dee659eac5b1a3534f3ec6d05/fuwofajilotejuperujemopuv.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e53b792515e1464b831edaf286dd4e9e/fedawasopofegetoko.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/28473163828.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/16371765292.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/65dc92b61faa565b5fd6838d6ebe9e9e/26215191557.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/sugiladetekape.pdfIn PDF document text
    • http://synhbio.com/upload/files/60061459133.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/74935893118.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/45527669580.pdfIn PDF document text
    • http://ave-france.com/pics/files/64218301578.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/tulujew.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109170402234751.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/3442099509.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/kepaxexuku.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/karezokipogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dramanice+drama+listPDF 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_off0000b673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 17096 bytes
SHA-256: 20e6d6c996225e0525e8de0584b165179f99407e9faf9ac75929c1ef56583eec
font_02_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10412 bytes
SHA-256: b6b3f48310fea602e6db30bbd4d1f1f6ca9ad3cbb6248b3d5a1c1508fc6e6aca