Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3c0a6a91c00b14…

MALICIOUS

PDF

81.4 KB Created: 2021-07-06 20:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9f14242246bc6e05210deac4dda76e3 SHA-1: 18d65273358fdfc1e761f68a72e876881cbd6afd SHA-256: 0c3c0a6a91c00b14b4434c44dc379362902f156704c2325de86a1014e42fb2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=academic+vocabulary+in+use+second+edition+pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10b812fc1---52484045202.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607727c2951e4---19807698062.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/39c4355dddc459511f2f1d9ba028b42d/8933597103.pdf
    • https://service-panev.com/userfiles/xofisakuda.pdf
    • https://lemanssrl.it/file/82773822068.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea10f6b90d---nuzudunutawi.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/22726227979.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc347f40d8---74391240083.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff6ac94e7---tazowagezexibogepu.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/et8qsi2ltq2rtd39sfn533kmdf/32727130365.pdf
    • http://elsekmont.eu/userfiles/file/98428180846.pdf
    • https://xn--fiqa735be48e.com/upload/files/kuwobased.pdf
    • http://files.ibiza-ferien.de/file/13137052791.pdf
    • http://uk-finansist.ru/userfiles/file/mupilowezipifax.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fd2119ec74f2f7ddde6e5a52d7632a21/giburatetefunanumikesek.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e5e37ed3---kazezalelo.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qmjqd22r9t67sqkvu9qc6vsrg3/654800558.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff8c89e7f---15075602835.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/16370750411.pdf
    • http://allaboutdowney.com/userimages/7343180001.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3911df7313f0e70d98d0e0a9d00d14c7/nisuwinami.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc0c04709---dosotukopejiwunalomi.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d1f25e779652f57aa5fe0a09334e495e/15777872464.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2b62983be4031b3d748b197ff2360c00/xizevuvi.pdf
    • http://samtekelektrik.com/files/vasexawijazugomalakobeget.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mogixiguvafuzi.pdf
    • 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_off0000d417.bin
cf55b2a6bfcc0664955e365fd42cb9956043d071291dc3592f12c523bc8fc694
pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 20076 bytes
font_01_sfnt_off00010600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
font_02_sfnt_off00011e17.bin
cee2931b0a703afbc939710fa67a26dc7e482d0af4d7226033a0146e444fad7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 11180 bytes