Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a0b9d839a974c6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04daf5492d136e5a165b75ce60d9b592 SHA-1: 3523a0d5ad59048bcd91cf7f1b53f77eced22cc6 SHA-256: d5a0b9d839a974c6ecea8a419368ae0015997ca919c90d4570188c9a63fba1c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number for a fraudulent purpose, such as a fake billing or security issue. While no scripts were directly extracted, the presence of numerous URLs suggests a phishing or social engineering attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://actorconseil.com/files/file/vapebexufozilu.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/cf4302ef783043a1851c72fd04421a0b/59187253822.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6247f22fb911e3a4ce1d684e0560bfd3/45085971644.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jovugowabexubik.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/094456f19e6506e19ac48f5657167308/57442376281.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/18147286939.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/sizoforulilaf.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/21a3d98aa60525f95956f1e0c67f978f/2233348543.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nolozurifapipulevinivefa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb8d559f6---41083777541.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/dodogozusipe.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1e4a4fee14622a85c25b1cb3975840fa/peterebekovogujutalono.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7ee39f3c---paxoberazad.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/380c2cf52c24e1f4366a2b0a9dfa9993/87381266835.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/71581096526.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/fixazutopu.pdfIn PDF document text
    • http://oembag.com/uploads//files/202108112250492303.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/4959314926.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51397af26---52170177683.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ba1e711d---zexagaxarezupufale.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5b67b410a876204178896a5c4ca63960/81953034238.pdfIn PDF document text
    • https://egf.tw/test2/images/file/45531818678.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/52018249142.pdfIn PDF document text
    • https://la-klamm.org/Files/files/febotowokataxezosodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rotate+pdf+in+word+2016PDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 10872 bytes
SHA-256: d0b1ff2f963293b9f2393731a0035eb3365e72d0901767e672cd022c3687c5d9
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16916 bytes
SHA-256: e4a1f318648ad1922856bd318e9fbd34d552d51f674562adcb8ceec0e093e120

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