Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1c3b0b310da27c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 317cab403149e721eebe4a7bdaafe3e3 SHA-1: e0383e7c9266807094515e010256718255f41f4d SHA-256: 4f1c3b0b310da27c49a818c9bdf3eed291ab78b6923ba6f739c03f1f3a5ff9f0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/oej0mh0kagftuqjq3r6cl6tvat/52273659057.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vnf1tdvgjt4od9c3vj6opgo4e1/42203076690.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gegikoretofujisenigesus.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/jeguwolekuwuk.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8006d28d287abb3d72547cc1d359f107/23707573624.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dowotanabagevipinuxapu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/fepeluvu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d9e15ff5---sokedexafumigenujaxoxumap.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qurrv4jq66k52qfd4pl9r2hnr6/rularetapiboxikixupudi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2062fbe828be5ab1d1638504909ceb2b/96017581778.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/saxujidit.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/75151019949.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/bac12a408679b412b9930b479a018c00/koxajideduril.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/74552020651.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9a3fp6bi6srgbv90hsdgo1akd2/remuzojoxogi.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/rerat.pdfIn PDF document text
    • https://aitalk.vn/upload/files/zapimodogiju.pdfIn PDF document text
    • http://amdind.com/userfiles/file/37753677198.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/29202273030.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/59330016229.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bifiwuxasopujaga.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1c80951950cd357a58cef8325ed1f077/meridakajepereka.pdfIn PDF document text
    • http://parentini.it/userfiles/files/96887498197.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/risalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+times+of+india+newspaper+today+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 18572 bytes
SHA-256: 898163579b50bf7f55c46ea93cdd50a7ee3a6613c07a2dda9fa16da2e3b64d5d
font_01_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 10924 bytes
SHA-256: 742c6fd723fbb7c3e8051d30056ee5958ee2602201c0c7a38a5c0dc8064b557a

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