Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c626a2a0f377d0c…

MALICIOUS

PDF

95.1 KB Created: 2021-09-11 07:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e181ba1bbb12f96a66bd0ecba4014bf3 SHA-1: 824d3d25b625aadad77d540c5412296caa8b92bc SHA-256: 0c626a2a0f377d0ca321c79fc8017f631f5c49636a4d5d8edf57875cea397c42
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many pointing to compromised WordPress sites acting as a link farm. The presence of a QR code lure suggests a phishing or social engineering attempt to redirect users to malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://laborke.ru/uplcv?utm_term=google+contacts+app+android PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4fb4d52d---salenalezo.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lufejetabulezobab.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/13320881325.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/81398198015.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/77347463878.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/fotusesodududigik.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/34769417333.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/12803726613.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/39650999984.pdfIn PDF document text
    • http://zubrcup.by/files/files/29582206624.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vuvowurodonefirosubib.pdfIn PDF document text
    • https://servicepapik.ro/files/bidewuw.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/9603218746.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/xafebasusax.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97f07bf09---93943827608.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/manifipupagejonesivuwux.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/tofujifokajabavuganu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/60634991204.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/livinebotefako.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nezow.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/garinunilotaj.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fixizovotiroguge.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/27065843939.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/21454062506.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd0397bf9---60494820852.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/68944366333.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_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 18608 bytes
SHA-256: a8d48ad176a01d23080ec0fbfd06faed47e7aa41c93863c07c08e00403c6d6e8
font_01_sfnt_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 10728 bytes
SHA-256: f0d822006458c675aa8004659191d875bc95d43df793b90e3541cd1ec385bfaa
font_02_sfnt_off00015641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1