Malicious PDF — malware analysis report

Static analysis result for SHA-256 d078b01905187a91…

MALICIOUS

PDF

91.9 KB Created: 2021-09-21 06:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12ee4d0c9da0d3789586d4daeb9480db SHA-1: b02a29647908fccbf545a14386f146b34f66fa49 SHA-256: d078b01905187a91fb4304ccf24454c8cb9bc0d1d387215087af74965c9c5b17
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. The document body was unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://defhjdr.friend-match.com/upload/files/29903290205.pdf In PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/61533084707.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/15699427310.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/44886592025.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161408d12457ee---54079815842.pdfIn PDF document text
    • http://intertravel.hu/_user/file/81506881231.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/def06df5b1c09e910269770e12e8e737/47345040790.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025fa0c5ff---88189492721.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/15879844332.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/62758192110.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fd438e0eae54d68658071b4cb6f17418/tazadewa.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/47087020206.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/27010916686.pdfIn PDF document text
    • https://path.mn/userfiles/files/36105496864.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/52704021918.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vebuduwepi.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/rakugimirutonuf.pdfIn PDF document text
    • http://tianfonmm.com/d/files/6684244318.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/47638034188.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/22419944131.pdfIn PDF document text
    • https://cape-electronics.com/media/file/fufobagegoge.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/91679773736.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614894659dc66---bekabixezawugenik.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/25596617947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+art+of+being+happy+schopenhauer+pdfPDF link annotation
    • 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_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 18236 bytes
SHA-256: 5f467a866e761ef9f224482e875050203443256eb1c47fdc457c7f4feff22bde
font_01_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14847 11172 bytes
SHA-256: 401356205491fc46a20c3ed611316ab7cd07ce58579c244677b0858659b453d1

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