Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05dacc884b427ff…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 19:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1cfe943e9476c496f9efaca36911b3d SHA-1: 693d2fc8b2e5bbb609a7c94a91839d6887c581a5 SHA-256: a05dacc884b427ffa59b923311c076a672f1a120f48488b883f7d01cfe0878ee
164 Risk Score

Malware Insights

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

The PDF contains multiple links to external files, many hosted on compromised CMS upload directories, suggesting it's part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a payload disguised as a document. The presence of a 'download' button heuristic further supports this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://natproperty.com/userfiles/files/27009104924.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/wasasumolexutikup.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/42824873993.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/96958598928.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dcea8f13---71793469162.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59f6f070c---58640978472.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/zobejedomejowu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/99445151202.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vosagoroxelaf.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zosabede.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061803431735.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88925b7763---diweje.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/gugifikoxitazaz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/22102039206.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610304afe3af7---32377728526.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ar0bn9k6p52e3bu2c0ub8p3jta/dirasodov.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ed8369f76350b0b6543e23c010358f92/tozutejotenanubuj.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f74bf3a8---36425753692.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/bezokoburuvo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c47ca5916---98637166635.pdfIn PDF document text
    • https://stopserv.ru/files/file/22847501455.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b01e2c17659---26708025988.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a980cc31e5---xuxir.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54056371987.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zepubuwogegulodevokaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=downloadable+meal+planner+template+google+docsPDF 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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10992 bytes
SHA-256: 28a81edf3f692b8c3ef69429d4739a75f7123156ff4feedfcb16a60d07def53e
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 16716 bytes
SHA-256: c76548a60e967b66b0915322506ce364ac8bf56c2df741888d8996e1a24be57d
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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