Malicious PDF — malware analysis report

Static analysis result for SHA-256 0430ae18320d9685…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 06:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0567b092f133653ca0200f9d73630fb SHA-1: 23e46c937d061d3c84b7ed70d905a83483bfc316 SHA-256: 0430ae18320d9685526091c78d589a82b45dbe13c4caeadc460f02b9dc5b8ce2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_URI_IP_LITERAL' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards attempts to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://malbreil.com/userfiles/file/maxawodaw.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb8583a2e---75041174183.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/95511326975.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85db283c817c259c9ccbb317a3e9cf24/vatugalupesene.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4467c7ae---18935589837.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/76174552311.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/9c37013f298275a3bdf97918f2d07bbc/7314332721.pdfIn PDF document text
    • https://raljob.com/userfiles/file/72922144424.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5b7a0a90---34302542701.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b083cc8be51---xadojupe.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/poxoku.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/31016164239.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-31/20210731061357762764.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/91440749441.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db30dae230---62096666280.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • https://protrialse.eu/files/files/4873710482.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a75e956a---bodirenarawanigufifuletid.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/bejip.pdfIn PDF document text
    • http://vipdiler.ru/files/file/48791923863.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/82187558025.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/28733493137.pdfPDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5376ff2a58---dugupiw.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/93553284523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=elterngeldantrag+niedersachsen+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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10760 bytes
SHA-256: 9766616322a0119577a0e9fd69b813edfa26072be13ee68818d0eccac622a5eb
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 18952 bytes
SHA-256: b7b0d92450434653a3d940b27f525bb97101143be87e0930e6554335dff7e65b

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