Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f2d83c37c021b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86c06b5bc63dd382e2d4f4f71190b20d SHA-1: 00c99e2c961e5467fc774c9b940ea338368a3818 SHA-256: b40f2d83c37c021bc9868ae2ea9e16f8f88dc437e9e35b026d5a1a789af769b3
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 of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

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://ashasuchikala.com/ckfinder/userfiles/files/sozaxodokujuzilitobifibu.pdf In PDF document text
    • http://webminmax.com/userfiles/file/luwebinimitas.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/kilefitenuduluxim.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_48946DE87F85C5F4.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/tamosixinebubu.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/guberopumobuxinovuwitop.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/67562138662.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/lubijuxugumanu.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/28866080875.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/50729375644.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/53686866052.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f45d5d749d---78072059459.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jufizularatujekezakujukoj.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/faloji.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/25965242167.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/62692461873.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97590714138.pdfIn PDF document text
    • https://clove7.com/userfiles/file/lifenizisenakoze.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/pefivalofav.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/xulilodofufakasotuwupazof.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/39111164175.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131da3e869ce---jawujutivonapanefogaj.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/66049d85903a64db44b28c9fc38c012c/69017323052.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gunexuwadax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+gems+clash+royale+no+human+verificationPDF 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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 11040 bytes
SHA-256: 9a1ba16f55f364acf8163e793a96c6b3a0f7cc45420b00b6dc7dc809974b5b15
font_02_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 15600 bytes
SHA-256: 08bfa3578b0b0b6cd86721a9bb23907ad4717b223a538bf3db5b7f165e73dce6

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