Malicious PDF — malware analysis report

Static analysis result for SHA-256 157e8d550e5d1608…

MALICIOUS

PDF

67.9 KB Created: 2021-10-04 05:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb5af72381c4a63fb220140eba2441ec SHA-1: b6477b33622174be9a6f42bb67727d3e308030ad SHA-256: 157e8d550e5d1608cbfca2517018ce01a9731207a85d537ba5250fad21982e71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, many pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious content or download further payloads. The 'PDF_IMAGE_LURE' heuristic indicates a visual trick to encourage user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=cities+near+georgetown+ky PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd87eb8fe1---fejibalepibimodemeboxa.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/2223937099.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vapirevefadababop.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/34313373728.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/lokitukumugotebixepizogij.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/13412186751.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/1058820969.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/letoliralukor.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/jesipomapawevomezorupage.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/lajanali.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/womasisanazijunaxibuf.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/bonafoke.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81de6e85b---88960976140.pdfIn PDF document text
    • https://diphong.com/uploads/19534436828.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/sitewogubusijo.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/fipevajotisipabebik.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/wipewodurixunuvido.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f42c54719d1de1a12e69ac50ff67ed99/98226062812.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fjspnsj836lj0npnrvj1c285f1/33582260834.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/muguboxixuzoraxaj.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192124148469.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/789495867.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/tidabajiniwejib.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_off0000ad76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD76 13856 bytes
SHA-256: 4afe40cea5d50a902bfd872a20aea819e873dd77ab5f6e028e05915319a56f49
font_01_sfnt_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 10560 bytes
SHA-256: 2312fa31bb3b911c287c6beb51046fcda7e459fc54c0bba7f4b7b1cb2ed96d53
font_02_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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