Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1f9237109ec30d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 22:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7feb400af4979a5baca473daf6ef332 SHA-1: 01ac300e5a4838abed1609e905c7020a533172e9 SHA-256: ac1f9237109ec30de7af3f508dcb2108493c7e6172fbda30b73f64349da0b0f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. The numerous extracted URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a campaign distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=watch+online+chalo+dilli+full+movie PDF link annotation
    • http://temple.mo/userfiles/file/lomojejegulekas.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/29968105114.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370c7bcd134---45289601798.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61479ceae50e3.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8bee4c8558569808d8bd021b73b659ee/zelofaxegovetu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/berixubemilibigof.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/rovuvoposaxazakeweloje.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/viget.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc8e2735f082de83a433ab6b121d5edd/zejiripepowinokowafu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/98401617081.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cba5d5f4a90150a01bc73b7616168aa5/2247914295.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78267134934.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/dca14172169b7514442d9c8d233e027d/pizuvoti.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/xakijiforasime.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/bodevojijogaf.pdfIn PDF document text
    • http://chongros.com/userData/board/file/jekasexusimima.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/73022006728.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/1076353104.pdfIn PDF document text
    • https://best-label.com/upload/files/57427080574.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c18ca6acd4a547a273af9e8adad5413/99214289020.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/80449313171.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090423014755.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/83944132117.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/mesuzadirisuxulonelode.pdfIn PDF document text
    • 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_off0000b00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 10632 bytes
SHA-256: 3523436266eb5ec03753c1b9202f1fa3bc30958c6f458bd741e4ee644c2cd5d1
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 14332 bytes
SHA-256: 17ce03171e058500a2f61275a50acc88aadeed10fb6fe630d02aa5ad83428e07
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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