Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc45dfbcef1d231d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-28 07:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7274df700936bcae0cca56526dcd971d SHA-1: 8bef66e3dca6eeadb00386fb31ea93d66a40e2b2 SHA-256: cc45dfbcef1d231d60b7ff796e2b325288080ec5f682998ee0b39807061dc6e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://betenagro.com/sites/default/files/file/62961529114.pdf
    • https://burgaseguros.com/userfiles/file/17685525715.pdf
    • https://metricgroup.it/uploads/file/medexikuzabibunemen.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7101c46f6---vukezofevoxatozowaraxiri.pdf
    • http://debeleven.net/UserFiles/File/38558435014.pdf
    • https://alzubidi.com/userfiles/files/38726270380.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bosefonakonosarudoxa.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6a34ed48---63819052467.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e2fb95f9---21406141533.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rgd3giur9qskibvgs7i393uvs0/44324215195.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6335f07f---3449334064.pdf
    • http://pileshoppen.dk/userfiles/file/31409143226.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/298807de38672eaff6a748bdd993dff6/gonelafi.pdf
    • https://lifetides.ca/cambridge/uploads/files/13149311921.pdf
    • http://www.bufolari.com/public/immagini/file/26514149855.pdf
    • http://thietbixanh.net/uploads/files/kusinopedekatazezigi.pdf
    • https://twinslock.com/ckfinder/userfiles/files/puvimilerokidujo.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/zukusewuraredanati.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5ap6sslddqe63s00m1f464ji9i/jigibufifuxofefanuto.pdf
    • http://ahrestygz.com/userfiles/files/20210627_065117.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070389e32524---simevobojujufutowigu.pdf
    • http://airshow-bg.com/file/puzowexega.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/semukajaduwekezako.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/10832b01d85bdf2a6126a985f39ba2da/livexenomunotowosu.pdf
    • http://lafenicealcamo.it/userfiles/files/jitaja.pdf
    • http://scales-center.com/shop/fck_file/file/39787250850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=windows+10+video+editor+crashing
    • 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_off0000f329.bin
b363a215155faf2bdb83e0f28d62d4c3e9ceb8b69f16c4ba64ebcf3149597b64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16832 bytes
font_01_sfnt_off00011f3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
font_02_sfnt_off00013751.bin
647e2d20b9f7e8764fd67e2444aac75da5c071499c1114076ac31a0b4b663283
pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10920 bytes