Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a34a54cdd0b4e1…

MALICIOUS

PDF

100.1 KB Created: 2021-07-13 14:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dadaba5488bb7863a7f2a904d1031c82 SHA-1: 4773961bb1a10ceedd274c320171b8e6ce6d6856 SHA-256: 23a34a54cdd0b4e1b630a1639812977a07ab81319df4be61967c686f0fbb1d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on potentially disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wastran.ru/uplcv?utm_term=who+is+the+protagonist+in+the+wizard+of+oz PDF link annotation
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3b870550bc45c58a7dbce93ae0ded571/24631549708.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/595551844db08361b8a0a59b5b336cd0/92123264027.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7a05a36d5ea986081f3a5ae50b314073/95747009842.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/83521211141.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/344242e5cb847c75bf03beb5b4584022/58796307593.pdfIn PDF document text
    • http://rts-3.ru/upload/files/luwenuzivemate.pdfIn PDF document text
    • http://potlista.com/file/files/4114170277.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/790cb6534e4ebb0111aa170dcf16a7e4/fufubaros.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/lifalopewidetavolaguto.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/fukaz.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/rivajawajanawawesopotavel.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9b5930c3be4bedcb68894d8f922590e2/romebawivazivamewil.pdfIn PDF document text
    • http://hodori247.com/uploads/files/27853772160.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/tariwib.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ef64f9ee---21807341288.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaf7521187---madetobok.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/891de2c9e9f0a88816070991a9aa3dab/79369825421.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/31662675882.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd81f4d09a---15045105432.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c56b4ed8e995de7c933613afcf2670b4/17960554129.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4a68eb5d---gozibupevu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pufex.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g0ir04tnkmnar6jd5u8rqft763/fewim.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3cd63804dbd00d9560c4878a2ea5232e/45714041290.pdfIn PDF document text
    • 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_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 10872 bytes
SHA-256: 91d1b59bc010adf90887be73be20adab69efac701f03da348e1002aad811de6c
font_01_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15452 17756 bytes
SHA-256: 7b8a4530ccfd49891ac655a0989321936255ee128a5e4bf864ba9396a25bb99c

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