Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3d2c6379adb993…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 19:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe8d00d1ac14a733cbdf44685b5e22df SHA-1: c914ba293744449c401691a0f500d3509af05493 SHA-256: 1b3d2c6379adb993a91aabb9ed1e03ce65795e7fbe02c691ac1e3ecfc781d3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=cell+biology+pdf+by+cooper PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/r0thu2d844rs254ls9h7a1c3ki/jopopilomivojirabolaz.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lavixofajozepofojekajet.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/juwuxosu.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/65204008218.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071238967fde---kudere.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/15474448964.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///lerata.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b9d90094d804f91f7099d373539f25bf/barofa.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/42986313529.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/viwopaxaz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cdf78d035---4270579166.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/34470701932.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c3239f1---vekudixep.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/22554485438.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/43711514565.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/goliderexibudi.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/kepavomifakobunat.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608378e68ea99---60084185092.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160cf905cf310a---zagujor.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/408630cb0342c0825cfcfe28a84fad61/majozajukabidekalisotebi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ec89273b56836669e06a08aff156a75d/47503420396.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/857842132ebcb713611e57afef4423fb/rigobotozimevaduzivuj.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/31365918683.pdfIn PDF document text
    • http://snsi.jp/image/news_file/47059563581.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/11748877552.pdfIn PDF document text
    • http://web68s.com/upload/files/3604963734.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16888 bytes
SHA-256: 1766ec786da32dc0f2f6b8f96b084d6f40bf249adda66592e8d9b27fdd89107e
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 10548 bytes
SHA-256: 23ba3568afa0a859cc63f450bc27adbab31fd137eac67c9a174fef41af35a70a

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