Malicious PDF — malware analysis report

Static analysis result for SHA-256 603e2ac7fbc3c5b2…

MALICIOUS

PDF

103.8 KB Created: 2021-09-06 19:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0c069c0321cca94797a27f4527505a SHA-1: 7fa89d52644e81ba4b619d1b48b1d847e70d3e8d SHA-256: 603e2ac7fbc3c5b2950d8edd24067d6b4bc2b13ddae0626d5e1a009aa6a9d132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b981533e88---xogiraxeretugixafizazala.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e98ba0a4---49278038137.pdf
    • https://cnn-logistics.com/asset/files/91065103991.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a710b975453---25074792100.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bc106722e1d31f6e1a357ec0d67dcc50/23557213392.pdf
    • http://cjatkinson.com/userimages/71470131230.pdf
    • http://toshiba-center.ru/uploads/files/fikodamixatopulufanavi.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8bd7f33b---gujom.pdf
    • https://unifor975.ca/userfiles/file/fulolodaluwi.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb05d55b2---36243845280.pdf
    • http://abpjseah.news-read.com/upload/files/17650978968.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2087755b23---pakojomovututinome.pdf
    • http://isvpro.com/custom/files/lerirovesugar.pdf
    • http://greenld.com/userfiles/74004891438.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210829_C333C882FD5F040E.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/nerebarubumopirumex.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e94b87c---99976207363.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4f30ef25d1f09cfd3833c37111870207/50696297512.pdf
    • https://webtechnocrats.com/upload/file/68585239573.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/05e189755cbea1efff0e803b98ea3363/48559711637.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968b7956965---mufumol.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fef00f7d---rirufizive.pdf
    • https://makenie.com/upload/files/72821723677.pdf
    • http://aldara-latinoamerica.com/userfiles/file/kafelakatewipi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b941b8a819---mawedilupupanozewavexadix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wordperfect+office+x8+manual
    • 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_off00011c2a.bin
30274a81e914eff6f94c2bd4885784516834fa24c25d39b2c0118c7c61be210f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 17452 bytes
font_01_sfnt_off0001498b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 16792 bytes
font_02_sfnt_off000161a2.bin
99cdeb98065331674bbe52fc27cadef2e524f5bcdd5f4032b335b1c71738f1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x161A2 17828 bytes