Malicious PDF — malware analysis report

Static analysis result for SHA-256 8098e18305454183…

MALICIOUS

PDF

104.6 KB Created: 2021-06-26 18:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 29fd2c99a5acfc5abb4fef81d39011a6 SHA-1: 91d1618794efd2f2fc7ee53d04d8a08d78d24db5 SHA-256: 8098e18305454183f99cfdf9f650d666d91fc9cd0ac2d84ee49b46029e9c877d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=meaning+of+hakim+in+arabic', are likely used to distribute phishing content or further malware. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 https://pistant.ru/uplcv?utm_term=meaning+of+hakim+in+arabic PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e62fe3805---82357036866.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/rolawe.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/sunuxoza.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceea7b50f---15887376017.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0afdf95bb42523d984ef900b17b6e772/xovumomegepijamafurox.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/86204932351.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gkjachec6j7903iptien11gt84/48768782226.pdfIn PDF document text
    • https://lemanssrl.it/file/nilaforejibamexukori.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8105926811f1e933af1082d0fa13d342/77808840881.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b54d2398---tusenibeboxadirebofatik.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/97a33e98fae0a3198cda192efcb0422b/vunozexozesojo.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xaveralu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a689e058122---vumokamifijemawivaxilo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead1ea8e6f---22782508655.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082c335d475f---45550561682.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4bea66ea3---4647822450.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7184a69n9cbstt92nke405vd71/benagawatogekupipage.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/dakilavefax.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbac6e78f9---34908832146.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2aeb3fce---65366560123.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884f5c5617---xaledijoxenakujibuj.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7d228924d6f2d4afc9ca2940a00780d6/34340838212.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea2ab32b4---52842003498.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014455.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14455 18888 bytes
SHA-256: eb958b7d4035b6b7aa406262221a46960b6b30806566a3deb65b6d1dc0d5f4de
font_00_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 24732 bytes
SHA-256: 65f7320cb7cbdc26baaf2f84d86e16ab129b445b75969bc963de5e37806f129e
font_03_sfnt_off000163c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDA 10696 bytes
SHA-256: 2867f7cea314d8f1e23693fd6871a12fc684b6df7bcfdcf5efdeb01208345bfe

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