Malicious PDF — malware analysis report

Static analysis result for SHA-256 a789b90cf19da013…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 12:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88cae2b34b501eca7acb561a92e34b5d SHA-1: 01040899555b40553325721fe76b6636835fa84a SHA-256: a789b90cf19da0136deac7d1d454787dfb3d24905edbaa6a0c35f4f192f5f914
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these external links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://phuwangnam.com/user_file/file/99306955884.pdf In PDF document text
    • http://9y.bfage.com/upload/files/20210914102600.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910111530.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/23125024898.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/kimekabif.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vubel.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/88074807244.pdfIn PDF document text
    • http://nprofit.hk/userfiles/45261530085.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/12928151280.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/raxojefev.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/luxujonavevedabafef.pdfIn PDF document text
    • http://bdnchem.com/upload/files/gubafejipomedavuke.pdfIn PDF document text
    • http://szm.hu/userfiles/file/sawovutizujaxog.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/11253173222.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f157fb4039---72830359148.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/97148927498.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/91668784f9a600f2322ff148cd55c87b/kupesit.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/janedivalumadupagibixa.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fuzuragenavoxafid.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zefivonolivorimawap.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210924112424.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/25531771687.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c900aef1dc---rikolijuxerazaluwi.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/tavotonifobosaligenopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ice+age+continental+drift+diegoPDF 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_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 17172 bytes
SHA-256: 84755e002536b303e0c93d2645f323b3131078a3afd20efe698dcd1d31952709
font_01_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 10432 bytes
SHA-256: 1dc4ba5d99e3e97e6fc9a88ce0282b7620a90b5bb2a18371126766fbab6ae689