Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a50d40c24c3492…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 02:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 380fafdc2417531b47edf6eff725c0be SHA-1: b50e226056f6a6875673f519295563426f5b18f5 SHA-256: 89a50d40c24c3492e2a7c820df8682ff14083fa3ddf20577dae34a074ef3a82b
164 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 CMS platforms or disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of a 'Download Now' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mgtuae.com/uploads/file/wemuvapeluvexodo.pdf In PDF document text
    • http://dinobajka.pl/Upload/file/23695428719.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/39963499428.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sepepetifutivujewojep.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/25429084048.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/jelimagofiliderorovis.pdfIn PDF document text
    • https://themalc.org/files/file/80099635050.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae2f3f9b3---negazarev.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lekaxam.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/71905374264.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/97757605025.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/nopezeketen.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/32803853414.pdfIn PDF document text
    • http://webs123.com/userfiles/file/29509097928.pdfIn PDF document text
    • https://labelmarket.pl/data/file/70334511943.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/30cb64b2ed34b7971c66a40157810731/lolaranupijuk.pdfIn PDF document text
    • http://fnathservices.com/upload/file/54676162336.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/tubalopenasu.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/boxezinaxasonuza.pdfIn PDF document text
    • https://anaksemut.com/contents/files/28642712472.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5gngrmvvib16r3irkhti65ehh6/vinodadupefatojat.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/pijipofodug.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/vawurisulimebu.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8336647685.pdfIn PDF document text
    • https://guijek.com/userfiles/file/budakuzolek.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gedegefidanogulosuzo.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/63333253088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=damon+ps2+download+apkPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10432 bytes
SHA-256: 0c03373f321c784f5960c428720dcb8896f1bb31a7000c5888e00b115ae6c635
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 18048 bytes
SHA-256: 27bb91173118902fdff8c4a9f8c7d65540d7e9cf8505c8a5aa740176033c8163

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