Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8705ce9c621c1e9…

MALICIOUS

PDF

86.3 KB Created: 2021-07-21 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2a07bc7d9c228329bd726de0d937abc SHA-1: dceeafa55aa0a312b1aa00d5e1353473aadcf95e SHA-256: b8705ce9c621c1e9c73472430368a711eecb83645c369971766156c678f0b65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://binarbaid.com/public_html/userfiles/file/gidunusuxufe.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fed0e52105e0bb219bcbb100a56f2cb9/59254664104.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gt4hqufu2ajp6frv547ru0a3o8/90783923150.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/toseborepir.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06164aff7---90695099414.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ocs7t6t4e9eguq6o34em9ggi56/92823030464.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621244602.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n64fnnogg6kgfme5406jetmp92/lokisixotilebad.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b666da4b---jorovufus.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/xediselotufajufobuk.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085782ae267d---25576387790.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c84a80313---27229018429.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f6575d9b---4165663636.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/tokubed.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/foginekatekobuvo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8075c1b8---7847045498.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5d4cc1e21052d93ef529df498136d7b0/jirajobamasuxexopenu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/demekitofudawonofizugumot.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dff7ba0e---45715991239.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/xukitotedatu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9c8e12be---vosilolugunezidominakorer.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/rorifovagidafiluxalodali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=son+of+the+south+bookPDF 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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 17240 bytes
SHA-256: 87332992a13a9c45c66800aca17360875b80bb1b02d9d40732a320933ebd07d3
font_01_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 10316 bytes
SHA-256: 872a5f2ff622b30ed56297373203b33583b20b10811054534c55b2aa02a66bd9
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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