Malicious PDF — malware analysis report

Static analysis result for SHA-256 d041fb3694680dce…

MALICIOUS

PDF

92.3 KB Created: 2021-07-19 14:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b1304a205bfbccb7ff4f24884ae2c60 SHA-1: 042a5e7fa31bd39015b3632fa869db864c2252fb SHA-256: d041fb3694680dceb64738374fb4de8b7d560ae467b24e570a4e6b18d34ad7d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tnslib.net/userfiles/files/80989138374.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7abb6e64d02083dde1c010dd3f012f5b/83229369264.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/26cab448862d69989655cddca60a0e81/xenazagopaxinak.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/vakil.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/29d9cb8ce86b8f556d1daa44930a77d8/12994969164.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4354597559---89418665263.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2bfe1075c3e84629a4e547e213a1c248/27140064411.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e478537cd---25121030561.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3566d0dde6---susutebaduti.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/22ad14efcca25ad35fd2ed984965686c/16645636570.pdfIn PDF document text
    • http://dnepropress.net/files/file/fotixoxowozojudesufoduj.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/jelez.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/78250774150.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210715_20F6FD81EF173225.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f52c9ddce83036db983bd199c6582694/99774141177.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/22630965415.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/nafimoviga.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/65874618909.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4tu513hm7ot3luekfskk3fq4m3/71687000084.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pevivinakewolofagopuxuba.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/4218165164.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3be3f904---80721870261.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e98edfc0495efce1521b318aa6879a2e/13305122721.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/15876848321.pdfIn PDF document text
    • https://defaico.com/d/files/voniwofe.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nizerised.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608073b9e9abe---16072125531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=where+is+vpn+illegalPDF 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_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 17176 bytes
SHA-256: ea5e7cc7c2f554c9427a0ffa6c3dbffff47324509ae89d19050881533a83cd07
font_02_sfnt_off00014c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C61 10372 bytes
SHA-256: 41f4e33699f3491ef7d52c437e107a37ce6cb33f8245c8074bc2738769869960