Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba33f230c446ee…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 504001aae764a8180b3bff77e00f4a4b SHA-1: a456210766eb974f9974c2be8674cb3e48f1a74c SHA-256: a5ba33f230c446ee1b1be0f0cdf17e2d6797e2c51e3bcfd213ca35bb0b28bf7d
196 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 CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://melhi68.com/clients/69549/File/kosalo.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a6a2f8bd---28957419722.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfd44c776c05acc23c024b7d297fbed/dopurewibowadewudituku.pdf
    • http://boschvietnam.vn/files/usersfiles/files/bawarenisezesobex.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070024a340a1---58899849737.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/31c0c6430a70d464aeb126345109423f/4252551101.pdf
    • http://wu-pao.com/upfiles/editor/files/87949268390.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/65093781438.pdf
    • http://pytextiles.com/userfiles/file/64964627615.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607623795c00d---2271399219.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/jilemofidejugidiximinigu.pdf
    • http://seamacros.com/upload/file/51277604383.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e10618187fedf14bd0be1af938f63f44/tibivebu.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/udl2fbpjgtefroim92umnej784/terosagirofebewapul.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb46e966f93bbdd67ae0f8966f922f11/gotaxam.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1b70acdb5eab68b3119010fb8cd8d2b0/kubedixefo.pdf
    • https://isleo.com/i_photos/file/89332004394.pdf
    • http://anthonyvienna.com/sites/default/files/file/50248309858.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088161a8ca26---41214788714.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a19279d593d5a1b63e99eeb85f8fb930/48588326010.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/gavodizitakitojijubelapof.pdf
    • http://thepokewave.com/uploads/files/14995566000.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/15757359412.pdf
    • http://poetische-malerei.de/web/editor/files/riwapafewunubiliwimo.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9beff28da---79633511069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=talent+release+for+minors
    • 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_off0000fee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
font_01_sfnt_off000116f7.bin
1a1970ff00993c10a3c1a6e3eb6f885ac4ceca8b7378a2099e44ff39cdf1c476
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 10340 bytes
font_02_sfnt_off00012e48.bin
402a7ed006d3371035ccfaa3f0904810911ea206c364f19ca2933c77575e489d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16680 bytes