Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a69f0b0eb5c98d…

MALICIOUS

PDF

83.7 KB Created: 2021-08-09 01:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b64c6e2e2918dd9a95cf489b7df58cde SHA-1: ec72389986f17bd9a48ef81781db8dbea5c5e3d2 SHA-256: 49a69f0b0eb5c98dfd1d118f5eaa162fadf41ed079f3e05428268e8c4a2238ec
236 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, specifically a 'Browser extension / update installation lure' and 'ClickFix' technique, to deceive users into executing malicious commands or installing unwanted software. The document contains numerous links to external sites, many of which appear to be part of link farms hosted on compromised or disposable domains, suggesting an attempt to distribute further payloads or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=what+is+a+computer+pdf+download PDF link annotation
    • http://exito-opakowania.pl/userfiles/file/74078351400.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8d2c79fd---77810854353.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a089474a80---70682439900.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/wuziveli.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb575b29654---sipunogafoposusobuk.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a41nctqh05s994c04n7g2ng7ke/15802420828.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f7164501---38248705438.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5440512a85---9012222393.pdfIn PDF document text
    • http://etnorom.hu/pictures/rukumosixulogatuwapalawi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32c5bd9a---figiruwuworu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42139429098.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f39e0aac5---nekaroreki.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/33526075022.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/81bf5beabaae3d02cdea7aa7f4e6b064/xifebozibi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/4843637137.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/pojibete.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dovowikakibipo.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/6055008944.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a7056bb25---kojiratiwosifa.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CA118B036AA.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66650617370.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/63980498820.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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 11064 bytes
SHA-256: 03468ccd59722efabc612d135d2d5b7dcd17ca6e3b73312bfb148836b3465174
font_02_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 16968 bytes
SHA-256: 24454debbb85771646ffe0386618a332d74e2715f92561d9c64623dcab6d1bda

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