Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73cd1465b79f93c…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 18:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a0b65068f4e9a6a8c0b4d94999e2ec9 SHA-1: 5624576577bb29490fe205d4c9d80cbd819332ce SHA-256: a73cd1465b79f93cfac3da118ed2858545af34215cba6c85fd43e59321840973
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan variant. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of these links and the overall structure strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d59888f45---jimojujubugafosilolew.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9i1pn69gcmhmtgimcbop93djm5/43108184684.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/60a0e39c66615cc071b74ca33d6d6c4d/66066105472.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/vivupeliverenifexos.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7b3d2dd0---71679039202.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1623964707.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wukegolobujixuru.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd321e0cfe0---mibunudutunijezu.pdfIn PDF document text
    • https://miet.hu/kepek/482066469.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/pilarutuduxosufijeladeton.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/cd5bfed91f1855226b67ede2a201d508/86720112589.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hih1qc4rivk4cofkvjqd6qil1q/bulavamozebuwituxozopijeb.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/11192919248.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/o87qf538fvjb2opm52njp2c4a0/kotokef.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae73e4525---zulaluxefuzutupukeritise.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/fudevuzekowufedopufelaxib.pdfIn PDF document text
    • https://puppometalli.eu/file/46415673968.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/99234938950.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/82862716752.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff89723a75---38138887241.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/mizojavomadavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=book+discussion+questionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10448 bytes
SHA-256: ba3d46768bb954be4e39e67bc9b6894bd9d82826a358447534defce9f34a3a0d
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 17128 bytes
SHA-256: ef5b5788f207d98920a7783dbfe1902b3b0e25153d1dde0c4f7b5bc2b9646e15

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