Malicious PDF — malware analysis report

Static analysis result for SHA-256 31520a61b1133724…

MALICIOUS

PDF

88.2 KB Created: 2021-08-28 20:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cd9bfda60cdcf26172a1db73bede114 SHA-1: 8866b7cac2d1743116babf0d457e95936aef00a4 SHA-256: 31520a61b11337248baede23eb90ec911c923636cfe4d151c1eeada5e533df67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the primary attack pattern involves leveraging embedded links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=deep+learning+with+r+pdf+manning PDF link annotation
    • http://aqbnb.com/uploadfile/file/9071521738.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/18467777170.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/gobugujexixowa.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ukt8qu3hk98aonp51q5qe3uqiq/bisejalamiv.pdfIn PDF document text
    • https://paperland.bg/uploads/file/togonejitimaz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8a0a0b6ff0461ebda896788c7c2663a0/zosutukozogoz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbbb024cc---15488613476.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210809084914.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/guxawemidux.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de2308db7---xadujarekopori.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/60926373901.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/biwowabaxagoges.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f696e0cb5---5808167732.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78af7c2e14912053aecdc8088f878a50/jipidujutivakux.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/fevoxofobul.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3df55f37108a87d1691a9c7365b50900/lidasomulavibowaxon.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/totogebetudarabo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7433a0d651e1e9792a5a766576d0a19a/xunuku.pdfIn PDF document text
    • http://sakem.org/userfiles/files/55558495887.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099af3be0bce---90691320292.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7df49ea73---23517212555.pdfIn PDF document text
    • https://ijp2.com/contents/files/tewunegu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4436cec13---23788957823.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842b7cdbca7---33913765458.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 10744 bytes
SHA-256: e3e05779ae91e17ddff1ff26a02d7d039e6608da9baab0ae1e11913813fc4173
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 19188 bytes
SHA-256: d3479cac7a0b66d85a0f3e189311c5ae863ca00acfbfa29b7ecd2262448d791b

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