Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc370d1759011c3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 542231318865ddda246e004600ee09e1 SHA-1: 7040da5ee9af835e4f3f9b1a12594b823e4d7b54 SHA-256: 9cc370d1759011c3940d74e4a0628219b2ed04b96c80f45c1d71894dbd5c2744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/eabb832ddc3126eaaf601afc0ef94eb5/41549746505.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b604edc519---rewarepofivakuzasapexila.pdf
    • https://careersourceokaloosawalton.com/files/public/89394552183.pdf
    • http://aktifbant.com/resimler/files/82040762343.pdf
    • https://tidurmalam.com/contents/files/jepidakawodanegojog.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/zofozudiwimavowagosamuguf.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/nozuditalugezofuxivuj.pdf
    • https://vinadesigndanang.vn/uploads/image/files/35193096708.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wivelaturomikegiruvi.pdf
    • http://leebyunghun.kr/new/upload/board/files/18064379833.pdf
    • http://bushurov.ru/images/files/16851841176.pdf
    • http://jnafarms.com/clients/864068/File/39506008900.pdf
    • http://nuestratierrapremios.com/campannas/file/nalosogif.pdf
    • https://cahayaapi1.com/contents/files/36768000085.pdf
    • https://jakspravnenapsa.cz/userfiles/file/96355190520.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a82ec63c---54492041298.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075626cb7d01---47258854.pdf
    • https://mmszke.hu/files/file/jozivitipiwozituj.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0a32rhhbp12o08ukbq9mr5sk21/44429812746.pdf
    • https://npkfertilizerproduction.com/d/files/34154411267.pdf
    • https://ivanda-commerce.hr/userfiles/file/60860479464.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5f6aae79---mipixusowika.pdf
    • https://chuyennhakienvangvn.net/upload/files/66961128263.pdf
    • http://needychild.org/ckfinder/userfiles/files/99599375609.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=symmetrie+aufgaben+klasse+6+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_off0000ea53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 16792 bytes
font_01_sfnt_off00010265.bin
ca267ba3760311e459899def76402651b9286dda2edea51eea0991d3e39d2e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 19924 bytes
font_02_sfnt_off000134e7.bin
fc781732c532dea3e9d62b893dc42f97bb8f0ab272fa3d16644316837422ed08
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 11408 bytes