Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f5a4cffa0ee9b6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 19:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 597412edfb2134409626597c88d5d890 SHA-1: 0a663ebc14a0326f28eeb602ebd4ee32ce6b19b8 SHA-256: 35f5a4cffa0ee9b62541dcac660c38b01ea79faae12117c3b8a01486bd6e2a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The embedded URLs point to compromised websites, suggesting a tactic of using legitimate-looking but compromised infrastructure to host malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=4+lobes+of+the+brain+worksheet PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7021a9f178---56727137274.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nozaxitidagejagiregij.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e15fe271b---vobukonikijaxerizudi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ed187c417---30179162762.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/tesivekotuwamotupir.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf66f0113de---melejimigelelowaxik.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/11381318034.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210813044741.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8936c443---zejirubimiriwigotatajik.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/nimetakibomogefip.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ad95q99d42c80l7dn6unp2lte3/1272566408.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/61791398374.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de977ddd52---kinasaluduruzebaru.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/49056152470.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/27277547591.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jikebixe.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/35967875486.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/10179636191.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/32135981241.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/72226798875.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/69357343921.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c58ac86cc1922af77af1fbc6b31a526c/21509177702.pdfIn PDF document text
    • https://diphong.com/uploads/448583393.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160970c6d75aae---6970520285.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 10608 bytes
SHA-256: d0efae23c8b9164e044d0b20eae9804777ec1c397ad25860821944ed4cdda68c
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 17296 bytes
SHA-256: a1fbe6e3faa016a3a3a8028314989f7b6fbd1f825028edfa7786da910c8c36f0

Open this report in the interactive analyzer, or submit your own file for analysis.