Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc265598de0b2cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 15:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 198634fde61878c4cc236f6573733fba SHA-1: 6fdab6f9a32387cefd0150fd7d73c5362ef3ea2d SHA-256: ccc265598de0b2cd6602c9a011c18520777ed1a1cac332a3e61f63f8ddb1bbd7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically suggests a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bangvetthuong.com/luutru/files/jozovaram.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/48899419329.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/52417231235.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/48608710865.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/xefogumaze.pdfIn PDF document text
    • https://ms01bet.net/contents/files/sajiduputetoliv.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b4de41e0afdc913e450fd75ff44b6ea6/11141851911.pdfIn PDF document text
    • http://accesoriosalmayor.com/images/userfiles/file/nafeguzimudu.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/24458768970.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/bizegerogefutop.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/35450094362.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/68725644865.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/wokuzolefulefajes.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/dogimuzemivovebukelusaji.pdfIn PDF document text
    • http://protok.pro/upload/files/67239459255.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/fesejew.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3639d10de9e32d6716c48e3ba990da0f/nutarebem.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3276822dfa3de17dcb121806dd583a7a/24951417469.pdfIn PDF document text
    • http://quinta.cl/upload/files/xupirejimomapetaweju.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/97489370525.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/fekujuwopobigizen.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210917215532132951jaypmn.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pharmacology+book+padmaja+pdfPDF 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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10952 bytes
SHA-256: 414714bc579054fd27d147166e2dea8fcf0c5c4279c94448190d40a827f76a41
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 17792 bytes
SHA-256: aaff84e163f9ec7fccf8926c1bf84bf4d42e8fa948aca84570af523ae5f76fe2