Malicious PDF — malware analysis report

Static analysis result for SHA-256 556b064c0f61adc7…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b153081f44b4d46936f485c99f61ce50 SHA-1: 4cf5070f31ea4b667965c1b08449aa0c7c5c5612 SHA-256: 556b064c0f61adc77799b163c26a9a4d4e8a9e518a9c87d4c0fb2ea8d30a25ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine its likely purpose as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1o3m1h04i3i3clrqi5e84rdjt7/69740884287.pdf
    • https://kp-bs.ru/upload/files/ziwubol.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65413dd3f9---lamoputifomenegejasizilu.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6e47575528c11995067f416654b2527a/womibojejetutut.pdf
    • http://arunimaflavours.com/userfiles/file/poruwenavuzoxi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086064ab95af---94156789755.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c0ce3027---levofudakevabogiwo.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/17506957516.pdf
    • http://alpha-cp.com/userfiles/file/33161193505.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b0d0030211623b97f46e5c946ae8640/80136933378.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/vonufinawipusukojepov.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/12d66491c02e1543d76a93d16fe78f17/7450474823.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5483d991f9462815d180d8391ef1c831/warupetoridajofo.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/sebaz.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69ed9f595---20562067925.pdf
    • http://andrelandberg.com/userfiles/file/90848546998.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad2e72f627e3c4e660269f9365c1c62/punut.pdf
    • http://kpotplace.com/uploads/files/98398062548.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/80l78lpu8bfh97jc1471kkmg4b/55176116357.pdf
    • http://dlzj.net/upload/files/20210601165529380586.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/g3qkrhp122ug88nsb5la23nkk2/logisoxul.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6397n52nrcskihj2vs45c599p3/5399296468.pdf
    • https://ringid.vn/ckfinder/userfiles/files/48753992073.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/4vf85o1ji9nqlbg3fv6kn2sai9/wukesafotisekevozuf.pdf
    • https://linhquan-group.com/upload/ck/files/rowinopawelojekipataji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=single+most+important
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 16792 bytes
font_01_sfnt_off0001230d.bin
45c278a974612d9fcfb13e216dde0661e782455945c79b49f3b5a4f0fda60387
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 10668 bytes
font_02_sfnt_off00013b68.bin
56cfcc002977835a15e7b2be4f8b9046192567f0ed1c582882fc8f96d427a44a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 17476 bytes