Malicious PDF — malware analysis report

Static analysis result for SHA-256 52970c9871a026cb…

MALICIOUS

PDF

83.1 KB Created: 2021-08-16 11:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01a9dfe4b19753c37e1c016820a3eecd SHA-1: b1f87a7b3c0a59945750023039e89734d9e50533 SHA-256: 52970c9871a026cbacda7f5ee04cc2f814ea57f145cff922af23c5db551e253a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d3b26559---61153089444.pdf In PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210801054750.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/73741844479.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/73220402421.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nodarasegolifivobopebivis.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kametaserazewiriwinu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf4397edd7---96565896150.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fo9igb87187ngi29ehn5ufj562/kamupenawixuzozusol.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/2817931720.pdfIn PDF document text
    • http://roocenter.ru/upload/file/58551815642.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/61883344158484e8f63d25e9d4956148/rajinufufavijo.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/42931826759.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/94019730105.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bf50c211d5b361e13cf07a172cb2ff6a/tamulakivawo.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/nozisipobapewuzu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2248a9263---47211172309.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sls8g79ilj51m8so7br6i8f0h5/29581871021.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/28494312381.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/pazoletig.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vefimifitemazine.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161165c495d7fc---92253119277.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/juwid.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/64138351947.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/pufomal.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/caed5fe5cf1dba1a696506ee052a7673/ruzorimanaxuzatila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vishnu+sahasranamam+book+in+tamil+pdf+free+downloadPDF 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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 17016 bytes
SHA-256: 267058dbdd5dca80837b4e9e0d7784a9853d1eb32d3f8b0a3b14840c4dc3108d
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 11148 bytes
SHA-256: 65215cbf013d3ed90a96deaf749f23ead2b4eb11db0b29173f6938451079699b