Malicious PDF — malware analysis report

Static analysis result for SHA-256 734b9435fcba9cdf…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 04:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e83e0b7d726566a9361db3e413caf1c SHA-1: 29c510991c3462cfff951f410c82e43fd6deedd3 SHA-256: 734b9435fcba9cdfa8b4f86ea6647a081bc3aae802ce46bfe7d28d135e688ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links further supports this, as these are often used to host phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=array+of+structure+program+in+c PDF link annotation
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qa8msmpu9hqlbd5g2av4ish813/88225954117.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/40366191760.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/16743716785.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/88573855072.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/25ec4cfc4cd66776ccb22233d973c6ea/12013753911.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/fibiv.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f499e5257---81105858255.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b493841a6bd---muvarigugifusijamasiluju.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa670ba13f---jisunigozikutobexabafize.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2c617aecff940406ef8469cacbac31c4/84558396599.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/zofukujupikomesaz.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/kimidomebatigebukamidi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112478aa030b---84818012536.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/43560697099.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/97841632166.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/802853048.pdfIn PDF document text
    • http://ledson.ru/upload_picture/zeselurafenadobo.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/zolufapaku.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hp4pgd99f2250sbfrbvfdv9ic0/53746414294.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/12972188640.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290b9d721c---vikatunibuwemujunukovofoj.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/62536775799.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jakigufosamurizadizixa.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/ada84iv1ckovld8sh8tpmej5sa/67880067069.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_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 18252 bytes
SHA-256: 8985b0963d754d352bb5d9148859d5da15e071817d6f1aa540d09943be71adae
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10972 bytes
SHA-256: 5efdc9069b873cb5cb5312fc3f036275d73cd4ebed0c4add2397283968a9d214
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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