Malicious PDF — malware analysis report

Static analysis result for SHA-256 faff5f0396bc2dad…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 15:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4332567004100293946ca0fd473adadd SHA-1: 27e2515faf719b0a0e61c7959ff92846e3ce3515 SHA-256: faff5f0396bc2dad7b79243bc23045a3e6093e0c6f1a1f26152d534bfd09e3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ukmriptek.org/codeIgniter-hmvc/userfiles/files/69369845548.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/jebixapowewaramuxevoxabu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/bepafugeremiba.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zulazexizotekinov.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372568474---bajurupupuwameliwiparaz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/39802066838.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16144c13a482d8---dufepikutonox.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/genomule.pdfIn PDF document text
    • https://italvaping.com/file/wakatifufegilo.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/materoxegefebuxo.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/tojegisujefapavu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/razukaxesoniwivemod.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/45143228591.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/99214712818.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/63973556652.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9120u16ammbq6jr6ee7vbglv34/zuxufawovurenopotikawedus.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210913004859.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161306d914849c---23121748007.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d484c20eccfece2d873553f815758525/buwalowaberepoma.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a65e386e7---lisujutapifo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pupiwa.pdfIn PDF document text
    • http://schokofontaene.de/idata/85092693840.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/milemigexogezilelav.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/92213680801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=video+live+wallpaper+for+pcPDF 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_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 17180 bytes
SHA-256: 81d636fcfbee2635b94776d15e3b1578bbae835efeef1bc8cf0290cd63dc2995
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 10364 bytes
SHA-256: a04e7d0a8df69579331ac9dac91a28802834b450ed76be07638e8f19e1c1df01

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