Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65397816395b7a0…

MALICIOUS

PDF

113.8 KB Created: 2021-08-04 05:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3496bcf692bf8ad00c755103c679729f SHA-1: a40ab59326f9edff0e5d4c159ec74f47df38c61e SHA-256: f65397816395b7a0d4c8ccb2f709d73b9826284e08d1282ce23a28b4f5a4129f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://synerhu.ru/uplcv?utm_term=robert+adams+books+silence+of+the+heart PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uvrbvfc9giqlujtvmhpovafj5n/53227877915.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/skeu3bbav4taaueqv7rv7v104u/jekedazusirexiwobad.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jetaxaxaramega.pdfIn PDF document text
    • https://heyratacademy.ir/file/9913095674.pdfIn PDF document text
    • https://dm288.rs/slicice/file/pokos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a176594d4c2---24127570574.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c557b046eb4---31151784961.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/38288065134.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e30abe9518fe0046e3acc77c99e4ba8e/58914645631.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/jamatawozelasegupazisazun.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/89637943562.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/75757119394.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8114765b3---10279526448.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/4810906231.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/53279444044.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4f24878a---favoranivepejakopofu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081597dbd797---53186448150.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zajovuminoliveguzalev.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sudutunidavaxokavemudi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2b743e0b---fopewoguraxisuvevamizo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/kubibofuvixavineja.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/96806105047.pdfIn PDF document text
    • 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_off0001577a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577A 11016 bytes
SHA-256: 9ab2d3a81a4eb2e4283ab93087dfd43c3b375ed047266c15ff07147780cb6cd2
font_01_sfnt_off000170e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E2 18876 bytes
SHA-256: 11a41084bbc66570bce9ee1fee2737a0f9d9715301374d7a41f40aeaed9c40e1
font_02_sfnt_off0001a16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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