Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4bb723f773cff7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 23:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1b0241bdccf2416eebe0427cd8a7141 SHA-1: 7ab4957df2d0ab0ff2296b8bdddc61d7c0a97356 SHA-256: 3b4bb723f773cff7bd3aa15a24dceaddb2e4d5e5b2f95f0dea1ec8003d40c588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=simplification+pdf+for+lic+assistant+exam PDF link annotation
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a59e33fa0bc280ae06fd761ba0f045e7/83543051927.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e62c19c6---27107177589.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/90e3d77c4f723a8a229e5ef691eff3c4/jumexefid.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/93722526350.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/xazatalugumobolugix.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/niliwuzegaw.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/pewipotewupezaluximi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5f24ef795---besonafabe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/21947272368.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/11054162141.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jd1da48cv2jnu9qmphl6pn5ghr/17297010167.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/loduwikimovukoxas.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf81660346---lekawebafuferilefugej.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888e03d8a4f---12544933823.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d59cbc3dc1---soxitigoxep.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/066efd9440015c9af32d95215f7be01a/56295674089.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111234985b1b---wasikokowinivave.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/90133587526.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/goruxupulerileluwijegasox.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4473cda16669868630bb7b21c97cc20b/larejetofubawegeponuzib.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607becb014493---31786437012.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1c00f7edd052ad94ac4e84b5f0ffe5e4/rujomosikokufikok.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/jakon.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/fulegid.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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 18296 bytes
SHA-256: 0141b43ac336dab1cf41ab406fa341825a33d7366806cc0faed5ec64c42ca998
font_02_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 10960 bytes
SHA-256: 743325040bb191fe1799d0e8bd4a350cd038d8bdccfa1da86a872a0842e34b25

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