Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f42e856181163f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 02:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 873efa51ec8306b65519c766285de2da SHA-1: aaf18bc38d56e66e9815b31bb501f95124905ccc SHA-256: 74f42e856181163f0bf39b814a93f42f0bbceddbbea474dccd018909a5c7d8b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the linked sites strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=social+dimensions+of+health+pdf PDF link annotation
    • https://monyetmesum.com/contents//files/65995175695.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6baff22f3639387ada9a89ed5435c69a/36199034684.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f4e27a8e09b990f584c25237e53f6fa3/nokajavilekotu.pdfIn PDF document text
    • https://renetravel.ro/images/files/43909506563.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/lupileku.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/28009174308.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/56675731869.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/donudufazugevarapulikasos.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/957795c2e09c4924ef4a948e7cec8cb7/xaxawajenelunixeb.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/88235718238.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/mafegow.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745eabd447d---zifeliwigorosexad.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jurunilinogad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6b3765e6e---50989413169.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/mufufubimedelofe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e09ee719---bikuxaw.pdfIn PDF document text
    • https://soechi.com/userfiles/file/dawefotol.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0936b4be8---72035144496.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/86427629196.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c4cdc8e---88739455594.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/91161943403.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf38a074---bejapivewixawejasamomu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acede6772b---ponedafozipojurevudu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/puzudipezukexulok.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17416 bytes
SHA-256: ddedd14b6732613e946f14fe732a630e0aec8c71f5fba2e7fd6eb18b08fa320f
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 10860 bytes
SHA-256: 2acb44a347b408aafc839921475065ee0f9f8a28ae1419b5c1ccf3ff0076bd0e

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