Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68a8ae1cbdd745a…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 04:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ca8bf99ca1021a1fcb07d3ed7b342a0 SHA-1: c55058f6afb6ac11e9dd1d5a600d8787254bdf6a SHA-256: a68a8ae1cbdd745aec4aed222ecbb02be506538709c86303d04e4e98e1e87231
172 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and uses urgency lures, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised CMS uploads and disposable hosting, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gelateriacool.it/userfiles/files/porusagadorewovanira.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mexubaku.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd960b2a0---85572667816.pdf
    • http://pekbdt.com/filespath/files/20210908101828.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/milelot.pdf
    • http://lepal.sk/ckfinder/userfiles/files/86790921862.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/pejadaj.pdf
    • http://ergakiland.ru/files/files/lodetafewetu.pdf
    • http://dunajecbiala.pl/upload/File/17876361052.pdf
    • http://bhk-aindling.com/userfiles/files/91622610867.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/wixaxokop.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/94520987874.pdf
    • http://autosvilar.com/uploads/ckfinder/files/87946971089.pdf
    • http://sswjeans.com/files/56235581316.pdf
    • http://manilag.com/FileData/ckfinder/files/20210913_881A3403D3E6EAE1.pdf
    • http://safiorida.dk/operatori/userfiles/file/37554582795.pdf
    • http://madveras.com/ckfinder/userfiles/files/11025417695.pdf
    • http://kawoka.com/userfiles/file/58823526382.pdf
    • https://toscanafantastica.com/userfiles/file/49116943974.pdf
    • https://brukspec.pl/upload/file/kizadodinadudusatu.pdf
    • http://gorsilawfirm.com/userfiles/file/zosawi.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd31ebf17---7501180429.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sniper+gun+game+download+for+pc
    • 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_off0000f090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
font_01_sfnt_off000108a2.bin
9cd6eb2526085add160bceb5332dc2fc691df38969276130b2e6e49db043b147
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 18384 bytes
font_02_sfnt_off000138c1.bin
6fc9be7f6abd0c5787212834da4ae0b7c151fe8155d96933a57d7eaeec691a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 10960 bytes