Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed47a6f7021d36e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-19 21:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2555ec8b8392bc84e2c36ee76badec75 SHA-1: 6d00b6920c63edf474d224d51c4951e358cf9538 SHA-256: 7ed47a6f7021d36e401096ef6a8ef4213c27255f77e6012c5d5da8a52be76953
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=srimad+ramayanam+telugu+pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/81215182011.pdf
    • https://valleyrentals.com/userfiles/file/busivulifub.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/mumiroranemefelor.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161370b44e3612---49082812866.pdf
    • https://mosallaesf.ir/uploads/ck/files/sududezuzunefagajuse.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/73405653798.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zifijekerebivigujan.pdf
    • https://yunglin.com/uploadpic/files/94562528462.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613106e969216---sodexesamufiwitakigis.pdf
    • https://gulamanis.com/contents/files/junolid.pdf
    • https://mandaljeebanking.in/ckfinder/userfiles/files/29109923546.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/99778639355.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2e6fcc3---gutuka.pdf
    • http://infiniti.e-library.tw/uploads/files/zavojogotukodakawebaf.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de0051e4f2---pugewazisiz.pdf
    • http://savages.lu/imagesRTE/files/8769380051.pdf
    • http://neodentpetrosino.it/userfiles/files/wadalisejufexuxusir.pdf
    • https://consultemergingmarkets.cubsindia.com/files/41712125642.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140050430f36---kotapezusemaxeviru.pdf
    • http://woodlander.sk/grafika/file/77316832048.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/soduzepemomaji.pdf
    • https://congchung7.com/upload/file/28011585287.pdf
    • http://sz-nuoyi.com/Upload/file/2021091308561424925.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_off0000aebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBC 16792 bytes
font_01_sfnt_off0000c6ce.bin
7886a7684135388358168e5cad3d587932e8f2a1d02a5aa05aa207f8f72dfb1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 14216 bytes
font_02_sfnt_off0000ea93.bin
071afcb67f88f7c14d6f172d73c411603ef50790b1bad5949f8913803423e920
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10840 bytes