Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d752f9b3af0c1c…

MALICIOUS

PDF

84.9 KB Created: 2021-08-04 18:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1eff0a3b16d653ac349c9e707d1115e6 SHA-1: a08c52015d6ecff116f5efa05064f002dd7b170d SHA-256: 42d752f9b3af0c1c35ac69c2c260eba46a98721fec2a8833d81c6ecbd1e7aa3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/44b5eccea7a46d7c19817bdd4494160c/27411070714.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcdda5147---wakexu.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/755c5f7b70ec2c7d250a859781eaa3bd/mipuwisuvelojuxavixukono.pdf
    • http://wamer.org/userfiles/file/54906528501.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085415481de3---zisuvibuvukuserixofutari.pdf
    • http://chi-kara.net/userfiles/file/runikemukokegonofabuwi.pdf
    • http://ingpoggi.eu/userfiles/files/fakuzewemuwizumaxejire.pdf
    • http://teplolux72.ru/upload/file/64341110470.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd341s076dqqn1njk8uj93cmhn/menajaluresugobenosivike.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e705108fbc77a84e757482cd736d446d/pogukefiroxuzafitex.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vc15lnmdh5cif4ip3k8d56s8v2/34014188496.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080056d3d2dc---kujojirosegu.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89682ca1d---94669512413.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f06532fc---kegoxefugesilimi.pdf
    • https://akproauto.com/nbloom/fckuploads/file/60430780553.pdf
    • http://flatadministration.com/uploades/fckeditorfile/pelofukogubadanevewopumof.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9cb96d8b---kebezerixivebevatu.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/960a018bf42f634ae1ec95195a062a7d/gafazu.pdf
    • http://hongshengfish.com/uploadfiles/20210602/210602072402290604t46nj6zjoiir.pdf
    • http://gorisum.net/fckeditor/upload_file/file/pukimuvaluxebafo.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075684c139ec---76927110876.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ac0259c1c35cbf4ff738252a9ee68390/fijifogid.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ec54f71e042473292b5044aa2c054786/57398924025.pdf
    • http://absolutelyneon.com/userfiles/file/sabiloketa.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/rafogovuwegafatomanov.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/e7fc9889812f790e14055c6a2865dcdc/xakikedumelaxevetizurogu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+alginate+de+sodium+used+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin
16575773b804207ad8df6c4095b2d41f3fd676988e689da8030048a665168f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 17828 bytes
font_01_sfnt_off0001145c.bin
d6cd6b200abc9c9c1ac95d8b97d80649d730d0df9f07507ed9760c4277004a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10896 bytes
font_02_sfnt_off00012d26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes

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