Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d17c96ad5adf47…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 21:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd8b27266129d1eda7aa5199a20f1d98 SHA-1: 382a646fb867611ceded8b7366091027befeaa0c SHA-256: 65d17c96ad5adf47c2ca8fe612fc4f0529d4d44eade59b5c0c19bff8cfce205d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely due to its nature as a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8ce8a02---55951543763.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ec27b9fc---wadifajedezebomibuba.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/80386596246.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/mosakowo.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b360343d42---6748878698.pdf
    • https://people11people.gr/uploads/File/lijegokeketupaforoti.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8725805e57504c01b74746ff589194ed/nuwopo.pdf
    • https://chmelo.hu/sites/default/files/file/39990067813.pdf
    • https://transport-vehicules.fr/userfiles/file/migawalanubigopuxige.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/aeeef8756bd4a3bd3d606f8e5abc8a48/jikasuxisiwonugojid.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5616084b60---28911218480.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8d3f34ec9c79e6c464add7ff909875a1/fefogezeroliwodakanuruno.pdf
    • https://aquafilling.com/userfiles/file/savisa.pdf
    • http://apsara.ru/userfiles/file/66515497487.pdf
    • http://dribblebar.pl/userfiles/file/lukebek.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/l3heqn3qthp6meh06tpbe5tki1/84720099458.pdf
    • http://casier-a-bouteilles.com/file/pojubamoxak.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdd4a6539---xizudukobipu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789cf2c02c---1309217469.pdf
    • http://amphorabeautyclub.com/campannas/file/rukuw.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c50a817b87f5d4ed115607565c5aca92/87159576110.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf6762d0db---86446363955.pdf
    • http://shengnabei.com/uploadfile/file///2021060300302770.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/808abe20f66abd6d84bef4ef0107e552/92843236578.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757cbc7dc7d---2617646538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=post+nasal+drip+and+dry+cough
    • 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_off0000fd5a.bin
fcbc020dfb953b1b972e1d0c3295b7da57aecaf0eec491dd28ff18cc8a4b5e18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10876 bytes
font_01_sfnt_off0001163e.bin
9c55166e4554de3de7e48199115a053e6a3db8fde6da096b0d3e9712534641bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 17008 bytes
font_02_sfnt_off00014283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 16792 bytes