Malicious PDF — malware analysis report

Static analysis result for SHA-256 8346261e76c40891…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 11:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc0ac08ff4795e947d493611f4dc3a8 SHA-1: 0dbc9a21f31535ba436514778a5db3bd63c9114d SHA-256: 8346261e76c40891f79c356ed5aeb60dbcd24b819fa0b8f82f1b7ff913f7eceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs pointing to compromised websites and domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=name+the+hormones+of+pituitary+gland
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/67842884993.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ed419038---96792620705.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ju39hatgv3pdh322akgb9kop2u/fotemopexulopebez.pdf
    • http://hwayinn.com/image/files/20210626_032928.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162531324280.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3h3lgu2t9gt7k2gv4c9lfqh681/somukogenifesozen.pdf
    • http://aceonlinementors.com/userfiles/file/84324108422.pdf
    • https://kompaspt1.com/contents//files/11677531621.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/gawexovexumuviwukipaduj.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/umuqdofi8uiqbpr1djocpc8b9h/kadipuwej.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/578sd6ddmgjbc6riel9neon840/23231832306.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/af7rk1ivmhcu9ep2gbvs6m7if9/7282825868.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d53996f1---valewovafaranegibelukorak.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/svb8k109v27h8q4sl2bg64n4b8/luzuf.pdf
    • https://areicon.com/images/file/32958493492.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/724877d7d004a2a61a26711ebbe3f98e/fadexamikumam.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad21bdb6b---69169595926.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160befd878b5b2---luxegixuvikojo.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134accee01---30566523156.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9f7217861175973702a4d58568cff4ca/misuze.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/57bruujsittoqaujl1ltightu2/xukaweda.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc121128ef9---81941859895.pdf
    • https://weeb.nu/userfiles/file/bipugaredawajose.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4642ecf44266a3dbe6b3843ec52009e2/19669626874.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608bff1cb1050---93176063313.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16792 bytes
font_01_sfnt_off000104cc.bin
c0111ada1cfaa8ebdf95705a31d644b3d0ab3203eabc29770d1292f3af135168
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 11136 bytes
font_02_sfnt_off00011e66.bin
00bacc086a71ed6772bfdd5f7b0296941227ebc5004550224945a2c787a639b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16540 bytes