Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae6f8816ab80ddd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 19:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c567efa3bb77b4efa8fb8358b7b1e91d SHA-1: fa99afa1de9fc5e3bb0f05e56a1767872856d1a3 SHA-256: aae6f8816ab80ddd3ef6596157575eccf9e3a6ab174ad33050de6917bb1c7b91
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links or potentially providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://ptaki.info/imgekoprojekty/files/51430478786.pdf In PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/65f7b065d8ac93b7044330cb69068965/xesijutiras.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/54210724445.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • http://atiksigorta.com/files/rimonevisamu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml6vl4vkv13gpj4phe1aiqsu6f/zuvidefumerenaxoderigom.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/595f04bbfaf30350aa8229b889a4fcbc/zusebabapobexumif.pdfIn PDF document text
    • http://nprofit.hk/userfiles/29658228194.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/nurutolalagodomixadados.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mi2nc4bssagn3aplvelpp53d30/79373147304.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/rubotewopabimisamum.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb1f71ff5---44365926894.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/40967044385.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/27253860589.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ol99h2j4m34p8h92308qpjnue7/58329047707.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/r4976745pp594jugoren2tn0aq/memaxetajetoso.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/25832733736.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh1u93jrlkn8bs922tm3lmo7r3/dutarotejafoziregox.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/genejivebo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ede7b14---bugademu.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/92f128eb255d672aacf0e1c2e8f33baa/49549582538.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/64840339643.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/koredesujugazegi.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/34050402246.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/tumejoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=step+up+transformer+diagram+pdfPDF 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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10968 bytes
SHA-256: c225ce7ce06bb1cd454666e853ebb28d821c35a88216983dbb0d6426e1a846d4
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 19240 bytes
SHA-256: 83d02065b9a72ce9d828a27d94ff509ac6761b4e8bf60f44a241efc11e1ce301

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