Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a61d535a6bf29e…

MALICIOUS

PDF

88.6 KB Created: 2021-07-28 04:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2e7d268541ddf0b1812ae6979e2c64f SHA-1: 8dd30ce0db19712115af733a3b7facbabdfa8d8a SHA-256: f3a61d535a6bf29eb3150748aebfb0329d8b9550b251ee323f2c0204deefbdb0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://acecaalcoy.com/userfiles/file/12196872735.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608289d1a9634---64122092209.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/85142559175.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd9d3bc75---lixemu.pdf
    • http://hulstcustoms.ru/uploads/files/silepoxirijinus.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/tupajijagal.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5ad4e6f399ed9038727ac2fc1568f377/50123916395.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c000ee1ab00---tosukugibubixasapimav.pdf
    • https://miet.hu/kepek/kinexejuzirodogi.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e5e34db7312422609c7c99b7f97f4c8c/63682065834.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4976fdda1b4238531c45f4407af11fed/90381924239.pdf
    • http://flexicourse.cz/res/file/60034256373.pdf
    • http://pointerboards.com/uploads/admin/files/57912067259.pdf
    • http://www.ecvbrass.ch/user/web/file/kirotemixopaxuriziri.pdf
    • https://abyway.lv/images/ck_images/files/pazafepe.pdf
    • https://fobh.net/userfiles/files/vogibowawifolav.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/amprdebpk9o39ooea9kmoukonm/88260885903.pdf
    • http://barsugo.com/ckfinder/userfiles/files/55308652514.pdf
    • http://project-lovcen.me/userfiles/file/vorebogodajobolisa.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d177a08c6a---15878010014.pdf
    • https://tradingphrases.net/userfiles/files/wizugoxabuditufoniv.pdf
    • https://jagominum.com/contents//files/77354873554.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/6975720845.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ao0u7gdq487oqur2e6m9une4u4/97516251334.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=air+fryer+chicken+recipes+gluten+free
    • 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_off0000f37f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16792 bytes
font_01_sfnt_off00010b91.bin
20278de4995eb4d8460a1ceac79cd3ecde6ffbddb742a1a202f9c6bffb741e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 18152 bytes
font_02_sfnt_off00013b11.bin
d669c71400dd90d77cda775e5b6661a000ebe8a39ad7145994bf9adc68dd0a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 10764 bytes