Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7856ce90e7aa29…

MALICIOUS

PDF

87.3 KB Created: 2021-07-28 11:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b0d4efea6e0ee13a66eba24b7d38847e SHA-1: 19abdc8f9da1acdc0c45a98748f8e1a7b8ac292c SHA-256: 7f7856ce90e7aa298caf06bfd76895f7359b490c60d5aaeabc315c4a7186e0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, but the presence of multiple suspicious links strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5b5fde78d35a9f16ec0dde0e4c3706e5/55097084199.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/37169500063.pdfIn PDF document text
    • http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/76734596871.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n86i355v8jep2eah9e804ao2ek/punibazij.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gafafafunomeragotup.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/10c5213e1cf38d78b6e687ad1b64bbf7/gojuxojumab.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xikakid.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/75398470597.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sng3ufaesgfkdi7u8lavhh7nmg/nedekazumevudunoz.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcaec23c410f474c4ea0fabb657e49ad/90504669655.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bsou1teickl9h4q550anjj5657/98304720314.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893e363d19---mumaralerawunotepukalano.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/26588930534.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/vosokexomirovuwidi.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/9582618282.pdfIn PDF document text
    • https://partnermind.cz/images/files/39527823951.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/kemowaja.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210726095957.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/is9kfg7pbbjnv46ga81nug65ac/66246927650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+file+a+subpoena+in+californiaPDF 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_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 17924 bytes
SHA-256: 81c779663d96b29098da286c239d7d6e347faa58e4fbbeb8419f8bcdb85b567d
font_02_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 10792 bytes
SHA-256: 1f6b3c69acfaa6218bf9d2841bcb2a74895648769d1ad720bc0efae86b65823a

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