Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d04dc4543afd814…

MALICIOUS

PDF

84.3 KB Created: 2021-07-15 21:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bec7f04bf98d3786d40aa2ab5f3a62df SHA-1: c176c81282d10902fad43cb47cc3495a07e103ab SHA-256: 8d04dc4543afd814668987c8d6cfb4b4b961b0ae528ad2a258a57a9df29af70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=special+education+interview+answers PDF link annotation
    • http://contextuae.com/resimler/files/lilavosakonufepekugopupe.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/19204211204.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430173547932563027.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160817164072e6---53713068139.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/davokakojevuwogejumojo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/roxavitopolamuruwoxavez.pdfIn PDF document text
    • http://camwater.org/media/files/5526899137.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/k5p8kkr7fi7pjetrtmgln69g9f/doxubudirosija.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zovab.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/gejume.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/wipiwitiperewaxogifis.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/08dfcd02af8466e6d53e099f4799d013/76046071330.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fezanediravewoduxi.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zegovika.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97691e04a---zotofodasofalewoto.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/22869868.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/81571071124.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa32894e9c---limomatotipuz.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mulitutamisetukitamo.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/tarepo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96ec8c37---figipaluroros.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828acba20a4---wimulusa.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kdese53g6r3p6uab2njhmj8979/84589783920.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297426a276---zizizofoputepew.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787863edec9---samotafituzijodolojekos.pdfIn PDF document text
    • 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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 10836 bytes
SHA-256: e91638c65b23095edd8538a35227f1dbe4d86be86b313f7aa8a53b4ac58a779b
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16148 bytes
SHA-256: 33f28b5fe153d61d3edbaa254e285e494d38e6f66a4c9c6fde93eb27485820f0
font_02_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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