Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7fd5d19a762cb1…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 19:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac7bb1a3eb1cb043dc6efbd0ff7933dc SHA-1: e3255256306c5d9322f3b33f3524e6a66b6cf0f9 SHA-256: 8f7fd5d19a762cb1b9d584be83c72efb05f65fd1959afe5a2300ab7367ee42c5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://driftwoodcc.com/userfiles/files/56058187258.pdf
    • https://rybczewice.pl/userfiles/file/47835372654.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079abb029ef7---kigiloninu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1e6dd021---xexazixupugera.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5076429a4---jurusomup.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a764e83eb2---38674714390.pdf
    • http://jrpst.pl/userfiles/file/ruzivopozixijazaziwaren.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f5403625c---7666011342.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b75a659a3---42041255521.pdf
    • http://muzeumostrowiec.pl/obrazy/file/zezizid.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511230823755464.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6af08f89---zedamuferedizu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3ir66q98mn93tuai12btnsn6iv/50244848303.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/37120487562.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb34650ffc---56273420631.pdf
    • http://2440027.ru/upload/file/tapisufipomiwa.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/31912957404.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/76258079181.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb33c4f5d7---wuborajojogofuzivor.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/sibitixepixepib.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/57b7ef498901e686aa4e4dd36d57c410/11612489134.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086637ce0fff---jilanijasipixobufapo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=central+idea+of+the+poem+on+his+blindness
    • 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_off0000e863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
font_01_sfnt_off00010075.bin
10733867e3aa35ddc5bb43b4b32a6dca004d002450a9bf937c5435f72f514ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 17344 bytes
font_02_sfnt_off00012df4.bin
b952e262abd8fdd10276c13a6f502fde17e9a6555e9d37ab428fb437554b8bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 10936 bytes