Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92b851b80351171…

MALICIOUS

PDF

89.8 KB Created: 2021-08-03 10:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: afaae646c5f9bab1ea906ae6a648619a SHA-1: 00194023dcdb4459d1e075a31a513ce0eb3b2f6a SHA-256: c92b851b80351171a7c84cd5405a0da35a23bab65e5e75185204607b610ac3ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external URLs for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://inwebjor.ru/uplcv?utm_term=how+many+calories+in+a+medium+caramel+iced+latte+from+dunkin+donuts PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mkcmcebvskdspkppkhggqr8ctk/vufulif.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/08ff44eecdd82bb5d7181d1e680bce0f/penebigemuwoxasav.pdfIn PDF document text
    • http://lawngo.net/fckfiles/bazuzirimezadoxokuboluju.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210801074344.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2a962e2d81cf5ee097c83282a2413128/rukudidukaxuzafixadof.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49712183955.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/76354937042.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210628094452_9ua2x6.pdfIn PDF document text
    • http://dentherapia.hu/files/file/7364034538.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/zererarelazipipojekujamum.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/falanenowa.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/42671523810.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/7013165645.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/10209016340.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6751260aa3---77324386415.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f57bee932---gifanozox.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/50972642386.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/dasozosubikugisage.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18103567406.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/51752310199.pdfIn PDF document text
    • http://zerosquareonline.com/file/masiruwopakugazenobejur.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/39061640252.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/lumote.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/83645768766.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 11020 bytes
SHA-256: 1507f5646d86dd8b5e2c43b85fee9fc426637574cb14effe05509cacd05afb53
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 17516 bytes
SHA-256: 286334e1f6610716d7830fe3b8867e869b64651eabeb5dc2857e8b293ac48a32
font_03_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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