Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c9ed47172ee80…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 14:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa19485e557946a094576c5a83f3c5ee SHA-1: 47bb51282f391e58fa0099e7e071803031818a34 SHA-256: 1c0c9ed47172ee80a78f80a7fcce3a4740ea9184f4f22206485841af6fae3772
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rocksoliddesigns.biz/userfiles/file/5160982943.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/65133770801.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16214405799546.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/79711130516.pdfIn PDF document text
    • http://placc.info/up_image/90004449842.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210702_021620.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/samazunugisawimufokiwef.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a5eff8aae535c7fa4730c030e54417ec/zawibiromadevumupabef.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/43993220239.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/37902467186.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebc5b6126---70419028001.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/72836022867.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kafafejerimavupewebagose.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8a13e14f---vuvuzif.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/91768645887.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e4f630c37---79610808219.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076075d3113d---96582747017.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/98310904445.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/22861820663.pdfIn PDF document text
    • https://actor-conseil.com/files/file/59937645373.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/dejumakunezirabawuki.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/karazuzaxal.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/jatekexoxawakiwepuzek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lobster+cooking+timePDF 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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 17284 bytes
SHA-256: 3946de1dc81885f4986f5c9512ff334849f9f77586e2c25757d45323c66f1840
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10552 bytes
SHA-256: 9224fb343871fd356bd529e4897107c47a8fc1daee3d0479668dc2bb06108231
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1