Malicious PDF — malware analysis report

Static analysis result for SHA-256 838ebc4e85612150…

MALICIOUS

PDF

85.7 KB Created: 2021-08-31 21:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9c72ee8270c95930c9e743a8e4d0739 SHA-1: c54335dfba0f7db8e03c00cd1b0bf558d06109b8 SHA-256: 838ebc4e856121500359c0cb65b021d64f1f31d601aa36a69be01053395bf4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1mfalsho7cfot12gflb5s13s53/likinixuma.pdf In PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/49452425245.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7c47e4c517db9ed7a704f20cdb923c2e/wugoxon.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/joliwuxogemipi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/46442321508.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/2138084843.pdfIn PDF document text
    • https://asi-filter.pl/files/file/3325993206.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d3fe237d2ba6822cd9a182d952c21536/moruworonomuz.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89252e35c7---fulenoxu.pdfIn PDF document text
    • http://walkandsmile.com/userfiles/file/wesatozivaremitivojane.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/81682004795.pdfIn PDF document text
    • http://technocom.pl/editor/file/jejazux.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/58330596282.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090875d43091---fozet.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/74595869761.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52b0dc7c9---boxow.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/567942268f6ed345106f7c84a2a0147c/jubugezimuditu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/jc2t2qdtgurratb1o714l07i36/88729704852.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/66820362065.pdfIn PDF document text
    • http://boxethai38.com/upload/file/18485912288.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/deroselug.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/14476651855.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7ee82b68848654c6f08cbd6808adfe0c/sapazalajologuravax.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/78fc3a97f997c53e9595ca7a78f32aba/lusitelulumuloweze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=play+mts+file+on+androidPDF 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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 17688 bytes
SHA-256: 34358c72242dafd4e846029725bd0ec40ea608c82685f9946b168b5a694eecd4
font_02_sfnt_off00012e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E12 10632 bytes
SHA-256: 27af0392106ef8ac35f573d4b34fc30b532764d111f3059daba8206c10853be1