Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b82f2d60682bd4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 21:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4a612832f84e7453c4d3fa7f1bb169d SHA-1: 7b5ae5a27528c77c0124e281f5f1d81140ee15d7 SHA-256: a7b82f2d60682bd457521ebcedf8cf141db15e19a13d42563c4913276a5b0840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or content-luring scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aeae154ff---64978199728.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/zapuxuwajijetavakajibeb.pdf
    • http://picassogift.com/Uploadfiles/files/tuvezub.pdf
    • http://chukysovin.com/img-svc/files/47931820639.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/38756916262.pdf
    • http://zzfcw.com/file/fkimg/file/40101601980.pdf
    • http://anm-av.de/uploads/files/xotamakis.pdf
    • http://chinastom.ru/userfiles/file/jaxaximud.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/95428848788.pdf
    • http://goldnumber.info/userfiles/file/47690378649.pdf
    • https://vieclamday.com/userfiles/file/31274774910.pdf
    • http://kirilmazbardak.com/userfiles/file/5061432073.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8e02b4dcd6569f8c96b5da0899133f16/42720645396.pdf
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bipumexam.pdf
    • http://rinsacars.com/files/others/kovuberitinezag.pdf
    • https://dom-titan.rs/files/gibafajifixubi.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d627c026---mivixizenifujuxixepida.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b7987dd8e---8360073211.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ed369f442be0e9890ff295fad150c301/tilukemaxudadagapake.pdf
    • https://biroestarsa.hu/uploads/file/86491359439.pdf
    • http://www.lovebliss.tw/UserFiles/files/wuxopenepegivaxekaj.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/pujudabufizaragofujiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tamil+new+movie+online+tamilrockers
    • 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_off0000d2e5.bin
5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 17272 bytes
font_01_sfnt_off0000ff09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 16792 bytes
font_02_sfnt_off00011720.bin
c1ed2496a1e46a9b114175a2f4fc7957c5218eaf0454cf37752078306d41e862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 10596 bytes

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