Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f8ad40bb6b37cf…

MALICIOUS

PDF

86.6 KB Created: 2021-08-15 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 415b139fb4fec70575cda16411f23811 SHA-1: c593a09c04a73f2d545bdc89984667dad0a9aa7b SHA-256: 00f8ad40bb6b37cfa1c7f5803743ba1177253bbd85fa68ddbec5fc95516b0948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous links and the nature of the heuristics suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://apartmani-mestrovic-krk.hr/files/vubuniselejemufominoxirow.pdf In PDF document text
    • https://dacinsara.ro/fckfiles/file/19705008000.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/rirani.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/u43pku98cekhjs94vbbq78knt7/xarinesonebelide.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/zuginivixokeraxopirowete.pdfIn PDF document text
    • https://verner.lt/images/files/rabusuga.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/19609268185.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/33384585213.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/88461176540.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cbv73f34b7qkup6k2i8at63tf6/74099098225.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/20440264463.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/serepuzijexuvojob.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tokobigitaketojoraz.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/p4192ik1fj09d2au7pb1uvfo7h/21942453553.pdfIn PDF document text
    • http://aimic.com/userfiles/file/33251418233.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be44ff53ecc---zusomepamixigusuxewa.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/71979977208.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7d1u8apae1ou10cfg6tg43thtm/sojofozifukuw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tedujebukefanuxasurivoj.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/kozonenaninoxuzobukeru.pdfIn PDF document text
    • https://menu2uplus.com/images/file/23315634590.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/42368470910.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bigorixevibi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6809f0e71166d92ac028696bc53a3e31/89414013324.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jivuf.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/raod6n81hs41etvq7ba95rkkeh/37190308113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ombak+rindu+iflix+part+3PDF 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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10872 bytes
SHA-256: 7ecd56f1e8a11c86502c5ddca09a021c37a3a6d62f0987f9fec655817d2ca6cc
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 17396 bytes
SHA-256: b07249b2bb2f06fc28583868b5213542ba32a9958bc61aa997f44a57399b284e
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1