Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db2b926445f711a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 20:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05ae0a7b036359d4a394224ef771ab6a SHA-1: e63c5ac99bb60949b089005d563ec33b66588ee7 SHA-256: 7db2b926445f711a4a99f9d33520683fc929896d8dfccc838e41fac32193b843
156 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 WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://crewmak.ru/uplcv?utm_term=101+songs+for+easy+guitar+pdf PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8fe6f99d---wupexivibezozibow.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zurisimexodoxu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/53997794564.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6b38cbc749ead46be74b7b3811d86bbf/32899640195.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lejew.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/66031206808.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/64100494508.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bagamujidulakuwomuperubem.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210902/files/20210902033817.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/70506795192.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/766554db9736118397966d6b41890479/86820239106.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/76275578972.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/lumevop.pdfIn PDF document text
    • http://klhl.com/userfiles/file/dabup.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea2a37c24---pevuguj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0aa1d45c29---74467122009.pdfIn PDF document text
    • http://falerisztika.hu/tmp/77794099417.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/518266ec5ae56a242509ed12549f33cc/jadagagutuperoz.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/m50ls8eta82ud4387rlknqasfu/56372974516.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/62393437157.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659a02a8f6---8720111118.pdfIn PDF document text
    • http://saptpadi.com/files/file/lebibafapifuvigivalo.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/gonitiseg.pdfIn PDF document text
    • 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_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 15496 bytes
SHA-256: 64690de7a12566f50e39a04f75b26cbf74b814c231f58a54d40db984268a18b2
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10920 bytes
SHA-256: b7c2dcf516499625368748262c549e530c77323e623ad216b80d2003144056e0

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