Malicious PDF — malware analysis report

Static analysis result for SHA-256 2160eb8417e7c257…

MALICIOUS

PDF

89.9 KB Created: 2021-07-26 01:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50bf46a28607a20a2c1cb5b280cb1d25 SHA-1: 4ad652b44d5329d679ce8377e9479a58596d5519 SHA-256: 2160eb8417e7c257faf75d2f487755741d2424bf1954c7c972200ea56340230c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious 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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2177c982b---27750369022.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb59f4f820---56801578439.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a275bcdfb20---12902363363.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7d98mlemuj10pl09fe5sch67c2/9014597358.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/42941862812.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/xagufut.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/momalipufeb.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/34637379313.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/zamejimudojozap.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777a5cc38ec---papepasotipiza.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sidijirexusumorexajo.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/74589636765.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/860156c26e1c2a34519ca50f63a9d4b1/pipakotefatevipodug.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/r4t3sbk0js49acddp51d0huaj7/dazukikokomusiwevepido.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/mazeferokineda.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb8da8930---bivubimojimumumigafuxeje.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079970b25180---pewafasopuxudewadofojegi.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/d8197ga7a0drt6uek12svjbhv0/80036473882.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/58837af394d5a9c7e158f4fbd6cb7d97/38932727774.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/dawibuza.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/zakosudepetaxanifu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • https://webmenuplus.com/images/file/23389670063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+download+audio+from+messengerPDF 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_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16620 bytes
SHA-256: 5ee1aa1dc43d39e045fb070fff312e7a744943edb331885d45545456c6a87f27
font_01_sfnt_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 10776 bytes
SHA-256: e1cfdb9e7a8093a2d117d77fa72a52e00e671b3594268350b3873b40284e33fd
font_02_sfnt_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1