Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60ac972315163e9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 13:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7748fa8992d13341d215d40881627d65 SHA-1: ea37a0e685adc4f235edad0d222c38e6f58a1080 SHA-256: e60ac972315163e9744226620f0ee70da0d24e714508b2e415aeba23caa499a8
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=cuales+son+las+energias+renovables+pdf PDF link annotation
    • http://chromowane.com/userfiles/file/58250865786.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/zilofek.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/79307975597.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/devexunosobemofizi.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/rimubozitulenuk.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/41099836063.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/nujoritevexidonomapaju.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/kijalumije.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/sukavokubozanop.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/40005033014.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/57e09b4ea09494cd36b7e3dd791c8338/getasuguvi.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/vubobogitojiz.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xowarenelelegiferupijiz.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jokisewadalifesamagudu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/24806512011.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/17478261843.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/63925755069.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607230939300a---91401153821.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6ece0b429f0074dac0fe6fc946ce540d/nikipur.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/40697921527.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vegoxaletokametulukuxase.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lovinoxek.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/051f0c59e2370aa20ef83e2e5d2ca3ee/14741416346.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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 10912 bytes
SHA-256: 6bc033122ba1b7d82d9514f033c017f402893675b57c68ccd9bd121e8c8e6a4f
font_01_sfnt_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 17480 bytes
SHA-256: 9c236d1c6091897d6b298a3c23bbbdb928838180a924cdf39683c8fd40e7a47c
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1