Malicious PDF — malware analysis report

Static analysis result for SHA-256 a001dfd4f551a693…

MALICIOUS

PDF

87.3 KB Created: 2021-08-19 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b10817685440ec64926851c772380074 SHA-1: 6863b511d860a5ed32e2f6fda8e5212d6e2a309d SHA-256: a001dfd4f551a693c180a850c093b76e238581d51dd4914b882de0837307c2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=modshop+naples+credenza PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160979d545859b---remixofila.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/omic1jd91kie6fe5b2a508p3sd/64596791533.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cbede4caa---wufiporozugalewer.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3uihge6d8j3k3e01gt1dl4qigo/32814172103.pdfIn PDF document text
    • https://mauspro.net/upload/files/fizoz.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0680b87a2b---72373162343.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609219abb8448---8094940893.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rl65t3il7egng4651p8k7q5qoh/dorebav.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/71635889855.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/92479529410.pdfIn PDF document text
    • http://fkhd.cz/data/img/57073460648.pdfIn PDF document text
    • http://aven.su/userfiles/file/73727254550.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wazabufemag.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kebol.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/zikefewukekosunejeka.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qak01kcg16kh51rh1o7hrhjugb/62511063342.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/36023609090.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93156602321.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210809074418.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609434721e006---feziropavugetirit.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3be08d0d7---nexefobojewilapijuliguk.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622930393.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eac7c153---kididuzitobiwovanil.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9eccf29c---xamofitifa.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/32225604606.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 16204 bytes
SHA-256: 221909f0910ead5f8c23bbc012de2e07810d076744aa0299aa432e261b697423
font_01_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 10472 bytes
SHA-256: 9ee7a187c2db2d5512eb36f89e53f971544c55ae940302e6b11a9d0c7096b561

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