Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c504b034f166fd…

MALICIOUS

PDF

86.1 KB Created: 2021-07-18 15:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 381b6e4513b87f7d2755627fbdf0955a SHA-1: 37aa92da7cf7a6cd033eced45e77fba0ebd051f6 SHA-256: 91c504b034f166fdc33679b2fe73d946be5b1f0bf6cbfe9e2a4f5b737a486d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. This suggests the document is designed as a link farm, potentially for SEO manipulation or to host phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2a59c4b---zugip.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0508f715f0---jexegox.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5debaab742---xaxorokoxepil.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/kefusi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/muwidexowo.pdfIn PDF document text
    • https://melz-feu.ru/upload/27546909096.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/kikusiga.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/rebadijafuv.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/fakobojawolopeveru.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/xuzefokefuvanijolud.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/374ef17de11c43aa9ae44a3f8b4ca26a/fupaxevufibavo.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/saluxevekaduzuwo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d3979abb10b---jononinurobupag.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kejazefaneramupa.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9716ec25---41680232975.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210718153810936537w887ltmsw1t4.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/248641ca28ee8830ef6665794045b072/nujowunap.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718296ae467---lukawex.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/49357e2ebaeee50feed1370646ffa4bd/86649095782.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/budejofepiniki.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4f4a7f433---92928581558.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/99876940853.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/vexijasega.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/74800877942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+build+a+mob+grinderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10740 bytes
SHA-256: 39461931d68bd9788a137d1c1e6440cbf2fac8840e88a1bde2e0434feb5abf71
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 18436 bytes
SHA-256: 19a56942704bd0698d7231d9dae78dc0c4e6be054d1beb1e2bbc5fceafe07bc8
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 3576 bytes
SHA-256: 9a349bf1e5a6023b1fafc0a6b34506c73c02de14991c39ff3454a477decffb16

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