Malicious PDF — malware analysis report

Static analysis result for SHA-256 736384def175d9c6…

MALICIOUS

PDF

90.3 KB Created: 2021-09-16 18:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97a999ca446229738ade7860ce9220b7 SHA-1: 0f1eea786e045c60eb85805dc7c460092cbc3edd SHA-256: 736384def175d9c6afe8dee4effa21a8c5566effd84c3a54fe2d007b4b045e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, directing users to various external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wastran.ru/uplcv?utm_term=mx+player+ringtone PDF link annotation
    • https://cplastik.eu/data/cms/file/41222988604.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/59019114157.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sixebesuvimezipevim.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/bewomovimofodesodenilus.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c8f1f604---gixowumumumafajaro.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/27528799084.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/losigipedamijale.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/vasarivapuv.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/57364227761.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vodedel.pdfIn PDF document text
    • https://sapporopools.com/contents/files/72681001053.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/du84ckk7a8fgvc1pm544pn9rsi/fudilijesokowefuji.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/pogitubuketakawanetegel.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/46102134263.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/95611356566.pdfIn PDF document text
    • http://delve-cr.com/uploads/67349622215.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/zijipojezuxuwaso.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613345fce93f3---jobub.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/72020338060.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/pofofu.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/luvulu.pdfIn PDF document text
    • http://czyxchem.com/upload/files/9549918021.pdfIn PDF document text
    • http://www.pvvc.cz/files/68199094626.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/buromirenimaraziravigikax.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/41234340418.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 18604 bytes
SHA-256: d7b567ff4c00b9b06f2283e05d5e7c76598933bca600d1aae9ce6daacda578ff
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 10468 bytes
SHA-256: 83c076b4a910125424841a86e7cd6e68623e23c0f95e1dba98befc852eab8e78
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 16772 bytes
SHA-256: 1df570b57b082043f7d5e2c137a09901a80d65f6769c69325e853b261e0865fd
font_03_sfnt_off00014393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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