Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f77d5637347c9…

MALICIOUS

PDF

91.8 KB Created: 2021-07-03 05:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8e821735c9962549520d02b3511f44e SHA-1: abe5bbf4d472f54145d513d65bba1a84e19feea5 SHA-256: f88f77d5637347c9774cdc100bdc6fd892dfea0e7c0d4bd9d6ac030ad026622e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://gasthaus-steinkirchen.de/img/editor/file/96854112775.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090979186faa---16386201019.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a64216243c1c1749d99b36fa2bb550c0/warojos.pdf
    • http://ruresept.ru/files/file/xezixokoz.pdf
    • http://dokumsuzgec.com/userfiles/files/27372287718.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1abfd97d1---vapabawe.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/092b59a0724d907cc8bf93650059689f/46675929517.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eaa588cdb---pikisaguxamon.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9f7672e0---90922290213.pdf
    • http://okfilm.kr/userData/board/file/wuxejake.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47768d4c25---63624955986.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34878eace2---wubazafope.pdf
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/sigikigibulipivisurojota.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2522b8f85---43276760974.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d291fa6421---33495628414.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2bb43f8e203a391fa12cc57a2ad8970e/12889730952.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6974d54410d9eae9010d2afdac714c65/jusutex.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7622ab58fc---jelenenuruwavamajewo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3229853a---47733948881.pdf
    • https://alihuata.com/userfiles/file/beramilifeguwabarejanunum.pdf
    • https://nanyangtextile.com/userfiles/file/46363100668.pdf
    • https://cometsecurity.in/admin/userfiles/file/53046656744.pdf
    • http://www.edgartownschool.org/uploads/files/53925311107.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/cgchd90t9frcd16vob4pdeciv5/dotuvejejefiges.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866aacfddd---jupifokenog.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ac235c0d197f0e46b4dd28d94a4541c3/2426038699.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+colors+make+lime+green+paint
    • 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_off0000ffb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
font_01_sfnt_off000117c9.bin
58847c81f1e8e6281f8808d9ba25c2ecaf1335fefbb183c06098ac425594f0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10908 bytes
font_02_sfnt_off000130e2.bin
b4377db15f5796150eb2ffbaf9c895aa26992e0702ac45f74fe4663afc96ea8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 18712 bytes

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