Malicious PDF — malware analysis report

Static analysis result for SHA-256 79950c74f31f26f6…

MALICIOUS

PDF

96.0 KB Created: 2021-06-25 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81f7a3551eabc2366a54d049a94597b6 SHA-1: e28107cca1b11c1a7992ef91fc539dd251c953e5 SHA-256: 79950c74f31f26f616084cf1d75ceead8027d056e17115f0d5d8297a6e4ce114
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://integrotech.com/zdjecia/file/82688244417.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ab50cd50fc8e8320da899b84ad718b37/93786897860.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73369e538---gisurufupulilopebikuwapir.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/37e7b907f05921a14165cf9ff8cde5e1/37731555207.pdf
    • https://inverpalmas.com/aym_image/files/70244789130.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/58453283501.pdf
    • http://on-video.com/movies/movie_data/file/18754422283.pdf
    • https://flyags.com/editorResources/file///27927292423.pdf
    • http://bitite.lv/media/txt/122/file/gowabukorulenetogomawupot.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/177cf9f6d4c5d3653774a59ade333658/goguvajusagogumupopazad.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ut8gnge7qlj6hl4prmu8v6hg3o/gulofesus.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fj7en3ebjg8edp21t5jqnmeh2k/22300184724.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dda90c0b---miwagivi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b65263b7eaf---vewexoxirulikesuj.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2f513f1dc565ebd31e2010d1ac18e7ec/jarijobegizufuse.pdf
    • http://esipro.lu/userfiles/file/2582187764.pdf
    • http://adacu.org/userfiles/file/20210620201747.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/df4bdae48e5b45a8a4ee479e0cf725f1/xewixilogotasirujavinoxe.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a6bba25c---78762115035.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f35d8967---gonosakowise.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7854b95369---joboritovagusitoredidexut.pdf
    • https://pacpartner.net/images_client//imagesfile/6406531258.pdf
    • https://implant-drill.com/userfiles/file/zazejoxojifavegu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8724cdeec---56297104402.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0b42cd927506819f5099fc0288d74637/26141044656.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jump+force+mobile+apk
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51c.bin
1d6fe79c7c3eb1b8d6abdec2073c43ec21d98f2250ae3834ac13a3f4ba3b2f92
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 19004 bytes
font_01_sfnt_off00012408.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 1696 bytes
font_02_sfnt_off00012c13.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 16132 bytes
font_03_sfnt_off00014184.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 16792 bytes
font_04_sfnt_off0001599b.bin
dc63cd731b8f5831bf0d1b9805e50cb576a91d728516c8dd95a429db9af0757d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10596 bytes