Malicious PDF — malware analysis report

Static analysis result for SHA-256 0279defb13ac50e2…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cade3962708cea0a3b1b47bc7c248b1 SHA-1: 2b2612d5dcf2bf3e4b353f943480692f002e9b4e SHA-256: 0279defb13ac50e22a45f75e39f2e47f981a197b0326928e9b6f84ee01deea0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://coming-c.com/userfiles/file/suwedewubepurotu.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021771135248638.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/112c012121c1e435703f711841ee9aa8/kenusafagavarite.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/likulu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jonekelo.pdfIn PDF document text
    • http://hydrem.ru/images/file/77339378872.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jlhrc9ghbpomcoc5rkft7tpftl/94405547579.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf38304472---4428858342.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/bdbff80540eb4d46063f9a1393ae528e/66815734128.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78279085667.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085c255561b1---3696598970.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/bamefuvafidiregumaxij.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0c8cddcc9b7298b07f04cb980024ce32/xikuxipipedukogidubezebil.pdfIn PDF document text
    • https://codecs.ro/images/file/rituvitusepasawip.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/nabavowenagimojituniz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b25905421d3---noledibuluve.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/86303349346.pdfIn PDF document text
    • https://press-centr.com/images/file/18275875893.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8440994f03---xapewunulakowavanal.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/21922325527.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/31e771c827e443f313ecb2217dddbbc7/87350229087.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/72fe24eab79e2938fab7a2b6abf07cce/rusafonesedike.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/jofisix.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f397cb032c---powojavupafef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=subway+surfers+buenos+aires+mod+apk+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 17368 bytes
SHA-256: 999969625d51c36658ddab448f341612ec340565f5a7d613ef7d9b4626cdc06b
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 11364 bytes
SHA-256: 36967cf8fd636ff761053def9531b2d37e4ae365ed86af7eb6a20562183ea3db
font_03_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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