Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabdb0c643be9afc…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 16:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b04eef57718227873958c6468d987fc SHA-1: ee44252dd57542be7ed884cc08eef9b75fb6d056 SHA-256: aabdb0c643be9afc7f6df266800c6bf0fd8acdfeaa338aae64946bd40bd75652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stalbeckers.nl/userfiles/image/file/gakerisofadejejogosabigud.pdf In PDF document text
    • https://hbfilm.ca/resimler/files/wunuzilotuvilokubebus.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/nobifu.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/18066789604.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///nitowunelolutubusude.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cdf8362b289fcb137003ca026bc67ac0/kujonigozigape.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lojit.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095c521e3247---xagiwod.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tl1g1sr51u2on3uk23f966721b/bovajavalafoz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081027f1bb3f---jazazarifo.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/94778808493.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/419d74c7c80962962870ec64918c2ef6/12830408912.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/dalakugekinadami.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/nixonuzojosababukusowab.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/59122732770.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/derazekujadox.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/10997949887.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9e7a9534---19015125480.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc364dbb6---wekunokawiluxinozeboz.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/bemirumuboragatefub.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/24509339515.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/20630098087.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/7102286333.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc7d488a3---72986503634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=alfabeto+completo+letra+cursiva+para+imprimirPDF 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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10824 bytes
SHA-256: f231b33b83116d8f237a3e816cebc0273601e8e4cb36ec70371ab90f21ac8d37
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 18976 bytes
SHA-256: 84c06c465ca9b81d220ca2710860a88ade66217c590304bb6458792318e88957

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