Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdeddd714da1818…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 03:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85731da61ac7dfe18b9030f03863cc8a SHA-1: be5a756c62d5c208838bcf690a26ec063fd1cb5e SHA-256: dcdeddd714da1818d29cfcba18bc2a98d764968c1d0cdc62f344b1c7ca14f4e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple URLs hosted on potentially compromised WordPress sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e31a2b38---kazasifamujivusobuno.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c762fa8---sasiperufibag.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/lewababow.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/80161275496.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/netajesapekonevikejeref.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jomorepamobupififenut.pdfIn PDF document text
    • http://geotersrl.it/file/labalasarajipu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b94381701ac5e0b5ed379442c7be3046/sagosowajigaralexemalaro.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088c12daa632---rofakexukipamatigakito.pdfIn PDF document text
    • http://leeandrewdavison.com/download/safajasizubuponu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wakironowufona.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/28721903543.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960b79e92ce---tubijilu.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/72368890524.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jelez.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202108220604392300.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/sevupo.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c2b9ba3b559233906fa8929f11f266f9/fopugujoligigenevazubepa.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lefagojatifosafu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/temavaduxawumijoruji.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xanarolixujemimumi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bec6bf57---dasore.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759a77f9ef---revuzuponekirewiz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/dezafujaparogofudafuwew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anti+bias+education+book+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6303e3772a78e027dcc509df78c6bdee/32859104479.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_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 10780 bytes
SHA-256: d25745607e6683c3540f1fb24a8370d426e56c5d3f6dd5cf35f1b7443165e1a9
font_01_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 18896 bytes
SHA-256: baf2bca0c2048ded04dffe97afa2b3998980f5dabf725f4de28e867cc00fe448

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