Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ef106c3be268e9…

MALICIOUS

PDF

106.6 KB Created: 2021-09-02 06:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d33eef038dbd1a2db7fc964126613151 SHA-1: 59db1fe1dc1a223385e2352fbd221ada26d3de48 SHA-256: f3ef106c3be268e92fe01e5a6feaed7c35ae9b274410c500b94efa3731771b29
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=the+story+of+an+hour+criticism PDF link annotation
    • http://kemenyseprosiklos.hu/upload/file/vurutapodiranune.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fce86027375017a75f658bc33bb0b951/zuxefazajal.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/juwid.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/90690116802.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/tagoterovagojese.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/rotake.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/52528522464.pdfIn PDF document text
    • http://inistor.com/ufiles/files/5420301494.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/80996878456.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/62368805370.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4i2ciap5n3kvtd05one57i70ci/608708342.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210521/file/16216044969934.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t7s1ssdkr17417bg4aj1rbln36/jomatog.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/75830241012.pdfIn PDF document text
    • http://www.asslar.de/downloads/jamiluxozez.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/kosejapiz.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/30288976519.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103780b9612---womavujovizakoloku.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/puniwifevusuzigogutifinik.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900e33b1ce7---gazareli.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/92710868157.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/butepewazezidura.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/nidemotuvaxuji.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/30158818146.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160944342c87d7---kezemasozadanuvuve.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_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 18760 bytes
SHA-256: e116552723df0505e8c0fba6a71dfe38f8065587b002c76f73fadbceb9cb4b2a
font_01_sfnt_off00016c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18430 10732 bytes
SHA-256: 83c68ef8fbc8a3fdfa1f2941e5d57422614ce2c7404590d7bd866df72e5ebaa3

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