Malicious PDF — malware analysis report

Static analysis result for SHA-256 074e91f5f7b25f50…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 13:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 193a5007675a631deb8a68325e8df428 SHA-1: 981de33eead3e4bf39b74276dc3af0fa40e763a8 SHA-256: 074e91f5f7b25f5046e4d43643090814a39bd0d09f4352c2946b82cccaa37e67
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://chetanaus.org/bheru/uploadfiles/file/woxuvug.pdf In PDF document text
    • http://secureyun.cn/uploadfile/file///2021091219204229.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/26067121350.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/sulipuwobuzesiterupo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/64988116211.pdfIn PDF document text
    • https://angkalaris.com/contents/files/34638533589.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161390524d8549---kirotodidipefarijisulupaj.pdfIn PDF document text
    • https://podimercrm.com/img/files/nalegakavedene.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/nodufuvilonezapifore.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/82293966593.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/79695117079.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/ramebilolawuxoxetupad.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/53198600415.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/74052530214.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/3695173082.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/9299067976.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56b10633d---99774376037.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mutibemaza.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3be20a798e21be378bdedd31e0ebd5d8/31249782776.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/goxakexevimureketewug.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323f90d2497---bubazugezizosefuvepizivog.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bowokeweredete.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/fogadufepevujajatiridu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99f4ecd6b224ae083dcace8e92ecc617/49559456460.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+power+of+your+subconscious+mind+pdf+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 20076 bytes
SHA-256: c8c7549ff9bbc4ac5fe0268297d335b129ef456d79ab03c4e55ef46d02f48041
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 11208 bytes
SHA-256: 881ac8b026206c12ae10ef363f894740c58b3283314dd427375c979b293a6bb7

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