Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b094196b700fb…

MALICIOUS

PDF

98.0 KB Created: 2021-07-21 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67b6e6722db1cdc62ef1c38835bb71c2 SHA-1: c27fede9ef33f3d1e40481e950600edc70f9c66a SHA-256: 437b094196b700fb8f83e5b0ef6134cb7b01736ba3253d3b6a92d0f7c6dee715
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70072eb64b---54851270668.pdf In PDF document text
    • http://soflcops.com/clients/83267/File/puvupazawolametinumutezom.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a277f56240527c034fdaf1b8fe726051/gijofeguwon.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf4fdeff3---matuguligojefak.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n42nquks10grgbtcog6br0e36a/97703930037.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/dupoguweto.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/75647479720.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/87852970117.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5d227bd3---33100503947.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3eebe2b5d62d45d1ab41a37022a81e3/maromasorugozukuresema.pdfIn PDF document text
    • https://ms02bet.com/contents//files/bojodilulolemakojupun.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/dphtv85ni2gk8ch8jildedtgvg/jamuvululazopamebajuj.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/kufajemog.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836594cb1e9---67390175100.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d297277c---98591308609.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/13721120571.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8f8c08db3308989b3ffcf03a6e2551f2/gobokakexanofawogeruj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664c986107---lowekozewaraxujufipi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xazoruzaguw.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/07ejndgltnb0q5sdg4df5ft33m/49446892570.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/sonubiwirujiwedepo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/jijuxesub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lovers+guide+pdfPDF 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_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 10388 bytes
SHA-256: 39b099e802d430d965f4cce8f26e642789e8dc96ef469a68312c13832a6b43b9
font_01_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 18216 bytes
SHA-256: 0252a7cb30a4b3720b21d5143e561cb7747d0002b4a27fe1ba1814307f606ff4
font_02_sfnt_off0001627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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