Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb1d792e33f1800…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 22:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80039e65929cf5ab1242efbcd9cfc997 SHA-1: 7a047c817c671cd5a35d3a94dea42a936244e43a SHA-256: 3eb1d792e33f180060dc88f7f8c54a4dda6dcb68529e97842191316c04a7a7a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable domains. These links are likely intended to lure users to malicious websites for phishing or other nefarious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://heorungminhphat.com/luutru/files/68509727073.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab85d417e---gowonovibumu.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kalexajejavexumasetenozej.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/mugewe.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85952265575.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///86738982953.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/nokakuliwovem.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9933649f---86712198706.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/28786496258.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/58128060807.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famajunu.pdfIn PDF document text
    • http://tai-group.com/upload/files/43876028237.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/bomekinirad.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140acd89ca63---pazipeduwudovepuzibimop.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/78406667207.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/67950118245.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9ba0037a06de3c78687a018863d5325c/95836519824.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109161100447910.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/35713369294.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/vaboti.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/2150637677.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/fapowiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bsc+1st+year+maths+solutions+trigonometry+pdfPDF 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 17588 bytes
SHA-256: b404c04a69f1bd06d2ee91adc76975507ce559cd33ff708606e36103a5aacb43
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 11388 bytes
SHA-256: 90000c290ed4938d0a9d89eb65942bfc681bcf1b04a18d72e6298fb13dc70497