Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5d645564b1ca3d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 08:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a9eb640f4e264300b051ff0f6eb2f22 SHA-1: ad708be3b38c7a1c1a8b3a6fe7b0dc9d2f0bdbfa SHA-256: cc5d645564b1ca3d42fb07885f610fe710688410a17d99665cc51a65a4d7f42e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=boom+beach+warships+cheats PDF link annotation
    • http://dailymaydemtien.com/userfiles/files/lulonevalokozifesiv.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/71822616761.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917081156.pdfIn PDF document text
    • https://electroagro.es/pub/files/debofotuwinorojozux.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/papofikisokebek.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/85165704223.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tokuvazanosu.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/lazez.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/56797431481.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/43485598441.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/voguxazorifomipire.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/sebuxedi.pdfIn PDF document text
    • http://dogable.de/userfiles/file/pixudodogivako.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_220940.pdfIn PDF document text
    • http://kvrhousing.com/uploads/45264329327.pdfIn PDF document text
    • https://cmf8.ir/data/file/54797811656.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vomagexame.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/19430187895.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/94441344054.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/96048290730.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372039aef67---54772338815.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378ae66818e---rinudufixarav.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/24285424801.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614307f687e5d---fajitesusawovawid.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/fefapugoxiremupur.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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 19588 bytes
SHA-256: b74d4f7aff51bb58a1d4d04d2c38d6395e954fd8f12c68f0a8639087e4662ce4
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10768 bytes
SHA-256: 2332a937da11f3061195d7309917b1cf1860c4ea28c700e16d7ef7f02ee4f9a2
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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