Malicious PDF — malware analysis report

Static analysis result for SHA-256 0275f70a306a4e77…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 10:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 289ee8ee0ce402d5a102fdc6cb368533 SHA-1: 50bce524e14189d9ef3ede8ad52c89914ef4d590 SHA-256: 0275f70a306a4e77bb78dcca0418ea205ad74b75a6c78265ea30d6df8ca69d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ac466273c---8152002763.pdf In PDF document text
    • http://bociany.sk/media/file/96244478963.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f5529a64---kitubogedelurinimoru.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/16662715550.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2603b3d1---gupoxetagojawamowosugadel.pdfIn PDF document text
    • http://imaginove.eu/data/Files/27079451361.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/nagabi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089914bc213a---3858186444.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/89586640055.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ecc1ce36---99067743206.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/svfg93rlim0stuu94kkh4s77de/gemab.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41360764370.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/88315179980.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/sawerivigubinedikijiniku.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/64413350277.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/84cmu2s6pc6jq168cbhdbli2a7/93089111157.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/joponugomanoviliteluxap.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/guvajoguwixosirezejarud.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/61639362796.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/708c5d37acc4b3efbf65134c6ef380d2/zosemigidadinotis.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/58968990796.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/xubakawolatuf.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fb0b071a---jopididogi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ol737jc95on299ajc3e2b6372/gakisovukamelejolopu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/larujalizas.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/35822856472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rinnai+infinity+26i+installation+manualPDF link annotation
    • 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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10692 bytes
SHA-256: b14eaabb9e07bdcc2191cb34cf7a8019fcda984113f33b6dfa579c5028368780
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 19360 bytes
SHA-256: b69beb9f7e28f89be0dc430bdfa6f1d9cf213cdcf222652627a235a052a877da

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