Malicious PDF — malware analysis report

Static analysis result for SHA-256 9400905479b62e8f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 03:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 223c1ab6c0041c38abcd1cdd09da36e9 SHA-1: 20f168ceda4b7dd0171b04e331af45393c613b1d SHA-256: 9400905479b62e8f60a4d4eaee740540f4aa16fcfa4011d559d055a92df563eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c662c6227f7f09a83652b0e677f9c8db/45300358151.pdf In PDF document text
    • http://alisawedding.com/upload/users/files/penisisamiza.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074b586d022d---99203110502.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3f3db23538ac2192715fe22f70e21329/lakozijeriva.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c4ea0984297116742caff62664534da4/laregunafoxokulupulotus.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/59bf22e97be2a11377486b6e6613e37f/27549564877.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/lc471hc9vl4b86d19lif3j4hjg/tenewelunomakotemixigisus.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/46059547397.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/menalul.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec004aa8cb---10962912028.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/26658250959.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fifor.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a339f026d---xevifelazukagejoker.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/molaruzerusegel.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/xinunarido.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/dafoledaxizizajibiwovaxow.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9fecd16c---38529990135.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86619b1022---vepojikurasogadiz.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/do9mlqq88tlngia8s7v90emc85/32797765074.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/9998816836.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/12073584688.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/336e87eb067e58f3e8112b41dcf22269/muzogiwugi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f19d82dd6---74243580132.pdfIn PDF document text
    • http://chineseclothingonline.net/File/xiwipukije.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3180e3c7---vomat.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/16687241602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=atif+aslam+songs+download+free+mp3+sad+songs+pagalworldPDF 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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 17080 bytes
SHA-256: 438a5307a5fa8577014f4ec9ca61f019b8fb4146a00e78409fd94f1e8b7f9386
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 11080 bytes
SHA-256: fbf4572f67906fbc6b03c5c0b8734c7f09a83f37b999a880f0516687e59f50b0