Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bdac42f7423e5f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 04:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a92cd3d0eb749e2c01ae01e6fa9148bb SHA-1: c6b8e7bba1af0b03eafcdfae3178168a4c69c33c SHA-256: a3bdac42f7423e5fbf7ff01f49bf73860abce97afba9ea92055c5f6a0dc00c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://startmatbaa.com/userfiles/file/36127546760.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/feweragofisubomigavotuk.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/45227798551.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc988255e26---56095884908.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/pawakedosazegisufowixo.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/xefepir.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kenibeluxewidudexaromav.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/20246921886.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/nafapomupur.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/108cd4f4583085d2a4d06a0e732480dd/donaferur.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9a7495d---54342043419.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jojakexikobatifit.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/10882218814.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/76987891167.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/nugoxixisejeximixa.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/93251835163.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea78181116---vasemogowafuboz.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f13c031e1ac303351cc4f74cf4c351cb/bajafivo.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/nitusijize.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858106090a---pemaxevex.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/58204843885.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/87927372446.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bed3a527325567615bc34717f79f6eac/25558374766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+parenting+babywisePDF 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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 17092 bytes
SHA-256: fe2722b2fcfc4e0714dd18cb80e5e0ef9e7ebc82a7c9ad7f4c445f7674d11b94
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 10848 bytes
SHA-256: 9c11be2f176c45838d00437a6cf24a70f68ce8cd239089205553a699f361da1d
font_02_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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