Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fdab6b8d19ad6e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 17:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbca203e9e5acdd53b4ca438b252f6ac SHA-1: 8747ebcd84a2cb37ed91a57f341d1d12922d27f8 SHA-256: 61fdab6b8d19ad6ece037bcc20e172536d583dbc6ce40f6ccd9fb656d8c2fea0
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23259c8b97---tuferurojalutebopi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaruxefewalimov.pdf
    • http://archpiudue.com/userfiles/files/59166623227.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adfbf2070---33705686365.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608379fc483e4---81264466008.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6a9s739l6omdph9tm2kdqk5lt3/90662363542.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16221447ab631cea1286be66d7b971fc/noxeworoxegifefijuzedasov.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b887a68b3185fc483265c017beee70d7/lezuzi.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83e81c63---23979723456.pdf
    • http://jaatkinson.com/userimages/22023908746.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d184135a6f---34483168735.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb75f6d2f7---vujuwovoxuradezas.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/41210166225.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b57a52bf8---47098609729.pdf
    • http://raffaelecavazzoni.com/userfiles/files/migemuwelajuruzifuwi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084193e3cd8a---6732426733.pdf
    • http://nhasachconggiao.com/luutru/files/65980072613.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210709034936.pdf
    • https://pacantioquia.org/aym_image/files/60114041700.pdf
    • https://poker-fire.de/file/38001417273.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/11949428700.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160718f3045818---71331544235.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/timekonurasipunekipi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=importancia+del+comercio+exterior+peruano+pdf
    • 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_off0000ec1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16792 bytes
font_01_sfnt_off00010433.bin
59d0e3cc89531e8b0784cef42c6711b949e88f2d28800a4f628fe59d824f4a44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10768 bytes
font_02_sfnt_off00011ce8.bin
aba5adc1e8a04c57001798bd375305aacb6770f1c64398e2f805bbac94763409
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 19560 bytes