Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b6275b373d56d9…

MALICIOUS

PDF

93.8 KB Created: 2021-07-22 09:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 773426fa0f9041140ee16c2d8b76f16b SHA-1: 0fba83725db8052f8909aaea525591a42c3e97a1 SHA-256: 19b6275b373d56d907212417fcee30454f3ceb485f1d0ee4b7eedbf41fe67e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e9ec0f12---nilesodamosuvo.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/395933533c42d0b61d12711c17347588/goturetovedadewesexum.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/27244711107.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/rekabazoxavudimetaxusa.pdfIn PDF document text
    • http://www.bandungmesin.com/file/loneper.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/897796b6d04f1ab617bd7d958253ffc9/silogipafidugafivewaga.pdfIn PDF document text
    • http://tms-operation.com/upload/files/desijebepudavusij.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9543898f8---28612576623.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/47501251857.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/biteduponobogudote.pdfIn PDF document text
    • https://hoongnau.com/upload/files/78736699584.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/18611106371.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/116dafe5bd4483c028598af593671f46/40104531268.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/30r92cahprn7bfbnm6ptrgg0l2/47810605542.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/390069c046f9a8dc232cc76931503001/botirupade.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/61u7ib8h33k6rjf0grl7ek41r7/simininaberubim.pdfIn PDF document text
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/tuzuwowikelofulovuw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7249c6efcfaf4063940045a91e389046/42038343078.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/tukamitutuvegi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oan9a62c850aapo66ahv2r73ln/57334365651.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/geguf.pdfIn PDF document text
    • http://robedecreateur.com/img/files/sexisodabameworapajuko.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5ecb9e722---40977759022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+greens+can+bearded+dragons+havePDF 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_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10712 bytes
SHA-256: 3a729902e421507460ee971745ab1ddcf1a9ef302220e8ab6419bf81e60edcfd
font_01_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 17468 bytes
SHA-256: 8c276e76cbec773b0f82efa73038767900f289ab5d4ddced1470122250b4a649
font_02_sfnt_off00015074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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