Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4b15b2d877a09c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09250c7c46a7676780e0909e7fd07218 SHA-1: 7ad2807aa4bedc0ab3ea895d51f310bfe34fc428 SHA-256: 3a4b15b2d877a09c07080a24c309378d310fe7169f6fefa813ab5c73701a5239
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains embedded JavaScript and links to potentially compromised websites, suggesting it's designed to download further malicious content or exploit vulnerabilities. The presence of a callback lure strongly indicates a phishing attempt, likely to trick users into revealing sensitive information or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilaide.com/upload/editor/file/49370660005.pdf In PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/xumoj.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/jewekamisem.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/93fb66078de8182d83f4c3e6be0e257f/11265116767.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/ripas.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sojefinamedipidurozu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/30619514519.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/96899345690.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/durawaremovuxawotu.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/kaguxiraxoxusinesunaduvid.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87734962182.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/99257656541.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8347e6ebbe047c25062c1faf1eceb10/67809382268.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/40009991736.pdfIn PDF document text
    • http://devison-matras.com/upload/file/92218223412.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/61533631993.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/28232680691.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/54292848174.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/81087010539.pdfIn PDF document text
    • https://agrando.cz/files/file/82770902680.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/55003982355.pdfIn PDF document text
    • http://come2menorca.com/images/file/50623779159.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/62741220616.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140540d35281---15054331771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+anti+theft+app+%26+imei+tracker+all+mobile+locationPDF 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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10412 bytes
SHA-256: 684a8e9d8dba82b37f92ebf128ec8bbcc943b00b140c7d7862321d355077f694
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 17464 bytes
SHA-256: ea169e3a555ae65082b9459e0dc9bbe5934f48ff5cfca321707d438fbf4f878b

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