Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4062bfdab6991b3…

MALICIOUS

PDF

89.1 KB Created: 2021-09-14 00:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d0134029eb66663e1a27ad2cd09382f SHA-1: 29ff64762e30a1f59478f28275ea862e8ef6318d SHA-256: f4062bfdab6991b30ab13ee94c5898a31d8414159900ffcecf94705f2a1e822c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1rn3tv1hcq4tmdfc73bm0mib5g/97663504238.pdf In PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/44064509072.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/viwidukedelarisub.pdfIn PDF document text
    • http://ipublicity.cz/data/file/95556014010.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/41858768828.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/93801294491.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf9f368d6---tazilerenitedewubikanax.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/36656924083.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/80939360695.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3dec8ec4---mosexa.pdfIn PDF document text
    • http://debten.net/UserFiles/File/belubukerewelufimunopasig.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/merirerakajiwi.pdfIn PDF document text
    • http://evola.it/userfiles/files/19217702336.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/roredekolov.pdfIn PDF document text
    • http://keyday.ru/files/files/wasusuloze.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/49056275509.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/kawunomakikesezunopidip.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905141953710153.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/junidejulijusazaf.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/rixadawiximexe.pdfIn PDF document text
    • http://guowangcable.com/d/files/82267325094.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/46ik9tvem3ilksutart9k9vrpe/89751509972.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c27ebcb---jerefamanematakogixezepi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e57d44a7f---71833811279.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/jenowavimem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+biggest+country+of+worldPDF 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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 10996 bytes
SHA-256: ea925cc2172d55b5b3347a2f6b8d8cba157a048ce9945d08993213bafd479c4e
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 17288 bytes
SHA-256: 5937dd198114279169df686a808e9f71350f3398c0791a3b40aec36929acf6f0

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