Malicious PDF — malware analysis report

Static analysis result for SHA-256 187f0c4eace3b83f…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 07:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5155adc96420cb5db7bb701cd7ca5460 SHA-1: 995b52f1c76968a940e0543a3e0e2399e8b6018a SHA-256: 187f0c4eace3b83fb8b9cf4cee0faf4fbafd105889a38f7314359f7fef888c2a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tapagubikoxemerodorepobo.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8934c37951d1a1ba3c4496364e51b170/mekirilakolutu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fb51927a---64423101534.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607595bae3c00---nevifasoduwip.pdf
    • http://agcslohian.com/userfiles/file/59037743065.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814abd90ac8---paxotavawoza.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/521c36d0ad9c2bbdd831e8654944a071/41601686413.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0muadf9fod51d9su24oj4a983c/boxiduxidimakub.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2381521542---somoroxapefofewa.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/pepanumixexirid.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/040fd298383038f187edf79762c1f843/74456092528.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2d1d3076---ribabitamirevegaduru.pdf
    • https://xistenze.com/files/files/mezamikegerew.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b20acb5ef---92606288101.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a23fcbc86db---dekuresudugil.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04a12ffc6956e603093f5302c591c49d/xovebujamo.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/97496670999.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b78615443e3a59d92ef656130d41799e/digexezazawozel.pdf
    • https://topupdana.com/contents//files/38224884691.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607728438dc54---71656794315.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2605c6d217---76586082788.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/52bd65f7d6604e236a337f7c911bd31a/gupulejalugazazomu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=without+meaning+to+synonym
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb48.bin
71f6287768a19b8db4b9d07c4a6259b992c1dd99b6bcf0cca8ebd2958ae60935
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 17472 bytes
font_01_sfnt_off00011861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16792 bytes
font_02_sfnt_off00013078.bin
713b2c74002d432387f5b798ae70d5933936759b55954cf230d56311980fede4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10616 bytes