Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f53cfc170f336de…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 10:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b20ca330203982cd6e59e9bbeaf35af2 SHA-1: 9c22798d6a74bc71324f36fb049990e0da4f5a7a SHA-256: 5f53cfc170f336de621c3e250bcef9bfc13a3006f6c008c3e0c1e836142580aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+run+pc+games+on+android+without+pc PDF link annotation
    • http://tyextractor.com/d/files/vimetepizuwobexetog.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/99651045659.pdfIn PDF document text
    • https://blv.by/upload/editor/files/94998789303.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/63889341288.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/46398042244.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad2a6a32b---94001406469.pdfIn PDF document text
    • http://vanhacollection.com/images/files/41270241945.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/bupevuziletedanovafa.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/wexewizurogatijo.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/woxinuwelotezonox.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/vinilojofirosejejal.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/nawopubev.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/82797809291.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/rinux.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/fudajuwufalibujutid.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/83504606430.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/61bbe0b6f114412d24233f3919e9d4aa/bedenorizewuguwu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917012508214.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/dagezazabotenejevamutixa.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/vejubosixu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef9131c1f22989ef3a088277055053d1/94233307005.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jegutarinubo.pdfIn PDF document text
    • https://mikludava.lt/images/files/fulawetaxobo.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/febaliwevenurafuvas.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 18064 bytes
SHA-256: 80e359c97348476e723420fa8f59dc37be13080172ffaecdefcc7cd3ec066b71
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 11092 bytes
SHA-256: 7da2867c02ee6181c1f16511f38d0f65bbcfb5fdc35d5e32f5ff7c51fb5a8cb7
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1