Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c491d7f9f8963d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 00:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a360c5f347696adf9217dab1366b526a SHA-1: 788a7a6b505d185b0b6b8d327162641e7b6b72ef SHA-256: b4c491d7f9f8963d4d189c575ab90485ca4cdb5e62c2e89409afc164b7dac491
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mousike.it/img_ins/files/6663553491.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dgd8fm0a6r66oe8m3dn7e5ls64/75367635493.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/sudapupedepikumow.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/keausjsin174uo7ldh91m51uqj/30628805327.pdfIn PDF document text
    • http://winso.tw/userfiles/file/70530181700.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069d66e169---80447512243.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/45c597ff4f2125bf6edfd4d178c7cd54/36910914739.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f766e3b4bd5da2ecf499ce13340f6f58/42216054243.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/65cf3e9eef46f063ce4c78b674252750/zumujugav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304af25ef---bolowanobedazorolabo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/koxuka.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zapaxodeposiniroji.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/81132939674.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a8360587---94721740935.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88426907a---27230177197.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/19210520028.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2bd3555473033389607eee7e736234b8/komojetokolejugisibideme.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/42590972053.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5b7ab313ffd90bde5481de57e17ab482/72571254259.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4qk0tcl5ipi3k9btokrvte0674/10191966341.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/565d36aca2e7bf9b5fe9de99764c1a8d/79210775213.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/95915749803.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/gimoxebosori.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086044919cc1---rawosatafomufakeb.pdfIn PDF document text
    • https://efnnma.org/files/file/zumesaduremi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=como+hacer+manualidades+faciles+para+ni%C3%B1os+de+navidadPDF 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 11192 bytes
SHA-256: 5013d62d62d75aeb8939dcfdcad5274408b6f666c17401dfca95230a81249dd2
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 18544 bytes
SHA-256: fdc3ba580e3bcf9702ae06083dd470aa29c64b68a7dc279bdc2534eb6ce03a4e
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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