Malicious PDF — malware analysis report

Static analysis result for SHA-256 8278789921340d18…

MALICIOUS

PDF

66.3 KB Created: 2021-09-21 06:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f26a6580475e77661bea7e6402c1bda4 SHA-1: d3937c6400d7f5c1fdd7484832ea9839a550c12a SHA-256: 8278789921340d1845e6e08444a5fa41365560e09dc21d46f5a9cdc560177fee
174 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 reveal the PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting it functions as a link farm. The presence of a raw IP address in one of the URIs further supports a malicious purpose, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://newabel.com/ckfinder/userfiles/files/57791863735.pdf
    • http://rlmlaw.com/images/edit_images/file/xuvikufifowuwiju.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16136509247132---70753284087.pdf
    • http://skene.es/userfiles/file/9904952888.pdf
    • http://yuanjiangchem.com/upload/files/panilapajitugifotinid.pdf
    • http://trumoi-khutrung.com/upload/files/41628879608.pdf
    • http://occahomesearch.com/userfiles/files/98489109283.pdf
    • http://medica-eg.com/userfiles/file/9979834497.pdf
    • http://lasfyy.com/uploadfile/file/20210907170406416.pdf
    • https://gangnampools.com/contents/files/74150220128.pdf
    • https://excellencetogether.com/img/files/file/50078998910.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb6960c8d---jejuruvedobisoz.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161315b276350e---46011989676.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/52269263160.pdf
    • https://branpc.in/ckfinder/userfiles/files/fotigaguvinaxuli.pdf
    • http://pune-india.info/userfiles/file/32835348689.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161463efe98c05---5816442375.pdf
    • http://cserepakcio.hu/xdata/file/bilabavafit.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/refokatixikejenewu.pdf
    • http://dui-antidote.net/images/userfiles/file/xigixa.pdf
    • http://gowowdeli.com/uploads/files/32059136622.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/95487785965.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wwe+mayhem+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d687.bin
e0362d0dca06c6830e39706bf250371b913dd04feeb4c474e0848eebedc0f73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 16328 bytes

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