Malicious PDF — malware analysis report

Static analysis result for SHA-256 0115a3a59526626b…

MALICIOUS

PDF

107.2 KB Created: 2021-07-16 22:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecae8a4b377481639a836a2a2bd56dfc SHA-1: b0cae4faa0045d2b993d0109e119bd2db5ba3df2 SHA-256: 0115a3a59526626b1f049ee7463fda75720fd0b8ae91cc12d43bd7d6aa2a831e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern is indicative of a phishing or malware distribution campaign, aiming to lure victims through seemingly legitimate links to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/83fa7e915b55aa91d4a235b1cad251ae/81411049395.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2mp9aeu3qruq32u3vdpt6r8ob0/84667102721.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2i6l4vflfseg28o93939iqih5/21340179338.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c9025332e55d45f9a096f30ba65c44bd/pozukiko.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86198f834---newakapirojegi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7c5c907c4f34364464b0c31afba38410/26884767767.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/64412211213.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cd4e3198---kotixe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/p6j3rhi719lcfgjk41ohlhuqac/90412643385.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da56fbdef46---wijevamafowipobojabe.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/82888738343.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/19968623205.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/68253745705.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9758800692---vilitaliguxiwinuwimal.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/16927053735.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///3696519225.pdfIn PDF document text
    • http://stattus.com/assets/file/xapinowepamajuw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260ea274e1---21990592357.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/odbmp38invt9vp1cklnt5g5rk3/vapaneseselafoko.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f462b3b1a0---82228489199.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/43366892620.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/buf6e8mtmc5vecneh5djccgnbu/8395227288.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5adaf837f47fdf2a1c24b1ddedff6e70/zimenofaguxejumaguvux.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d4c776e4761ae50fadf953b48ae2460e/dabod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+application+letter+for+a+teaching+jobPDF 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_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15756 11116 bytes
SHA-256: c3188202d2ed7838c6caef42780893e5f2e8320002e6dc371da684f650506b2f
font_02_sfnt_off000170c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C7 17916 bytes
SHA-256: f9161c746e760945048ce0090b8dfd69f54ed58991fe80b796a09298d96f4a16