Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa7553b72af2787…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 20:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a19bd4fcf34e4bb98a140a20d978bee8 SHA-1: 087c0b4759705a948616babe9d5b75e52806d2b6 SHA-256: 5aa7553b72af2787ba57a8ab9b08642ff0e114d7743b18fc9663f1a57f83a32a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=psychologie+clinique+livre+pdf PDF link annotation
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cef56615e---jinizuzijovomomafoje.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8c5f7f4b371167bf584412199e9613f3/winixajiw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607060825fc4d---logulirowo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pafegozipowikusu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lt4222hlcq5gp3lahvocqpqd74/meveda.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cac3219e6b4d5bf3dc3979178173f128/32288307517.pdfIn PDF document text
    • https://synersys.fr/contenu/file/64891678353.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084547d595e7---46257005499.pdfIn PDF document text
    • https://agermag.ro/mm/file/87683929980.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pjlf3nct8ht078tv8agtb05qeq/13713383930.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/bizupidulis.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/6472520437.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90b8c2f3bf---26067800766.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/10/file/94122009298.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/26d4e13530fd97a6cfb2a94a45c4e6f0/zopelixosav.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gebakexetezulagavujif.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/nebugirobaxe.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/dobolatubuva.pdfIn PDF document text
    • http://industrialdevices.in/uploads/nomumob.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3529158ae6564314a7e9d2fa0af695aa/xugapex.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/gaboxatakorojigo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a3qdo8l94l0djnpg3unrmg6016/wosaragipabimusezez.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/de73fb0ed10dbedda69e2c0bee66b946/42190737963.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 21104 bytes
SHA-256: e75d1ed5a8944477511e32399e2f42834ec805cdfc0b17cf39094f7929baca0d
font_01_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 11068 bytes
SHA-256: 2318e81d8cae895b0de83b95f21fde43cda53c1c3fe7fa89bbf3e2a3a4368e9c
font_02_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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