Malicious PDF — malware analysis report

Static analysis result for SHA-256 5145b0b425f5e517…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 10:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 990367b81a5998de60cf483a9f359519 SHA-1: 6d726fbc0288ad11a64727aedb1aef5af8569a46 SHA-256: 5145b0b425f5e517115682e04ab73fd530106857cda9630d7341690bd97f49e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'link farm' heuristic and the specific mention of 'app to open pdf file in android phone' in one of the URLs indicate a social engineering lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://championshipsportsrings.com/clients/23492/File/sinewirofevemuj.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc5d5b53f---lidazupaluzisiganopamim.pdfIn PDF document text
    • http://didula.com/img/file/31679386201.pdfIn PDF document text
    • http://foodchemsino.com/d/files/buremugodoniri.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7eeaef65ab777a2189ac9903dca626f/somevuvizixij.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/34427598159.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/58826659773.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/kizos.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0a41a164afe4b6ccbffc7ebebeb6dba2/xuwedubetaba.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/113db6f7c4ce67595bfc52f4a5c41aca/xigodavorimojusufudeveb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mibakoboledavi.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/16011436745.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/bawodopafifurugiv.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/borukowomanavoposasamax.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nilisim.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d4ece137---lalofevubuxanavavo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/tanoxojumoxodezomusipeti.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/76590011635.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/mumulinupadasozodamuxinet.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vubumunagod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+to+open+pdf+file+in+android+phonePDF 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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10408 bytes
SHA-256: 94ba836ba9af10028e4bb71f27fc3024a9f66ae4e4ef6fee3cbd6585bdc34e02
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 17724 bytes
SHA-256: 7d9568082bb0579724386bbe3bd10ca68947046321af35d5f31baefda4800cf9