Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa068eec7401810e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 03:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4516c6c471209b576523c1c397e6766 SHA-1: c0c6eba019d5da51b3be02c0248080ca5d6c1c9b SHA-256: fa068eec7401810e3e8a1fe04ae3d6301077409db0d42d49cce97f179566eaf4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of external URI heuristics and link farm detections strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=top+app+for+android+tv PDF link annotation
    • http://vin-baietii.ro/ckfinder/userfiles/files/4275740266.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6135d8a7a7b4f.pdfIn PDF document text
    • http://clingac.es/d/files/88236998070.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10671579776.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449205085---kalenumegasuxubemat.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/sedadenajavitete.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/gagukedojarawuwidube.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xubisemokanukifenakugaze.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/44294188225.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109071420038911.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81195120637.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xinunem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135655c5e8d6---5093929000.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79882712815.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/5830485120.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/32521462775.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/87070384192.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f33885d00---97489070486.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/48238701030.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_165836.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/wefajiluvasexelulozuro.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawoze.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/50502583270.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/vefajesogobenekulerulik.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_off0000c151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 10172 bytes
SHA-256: d4ecfdef703607b4de8344d88163a786e289e0a6d1f4ee10f59516d4cdb693b7
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 16344 bytes
SHA-256: 4db68a80a77d58615c37462ef64b940725704b94af2a10feae9dbf0e705e3a15