Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1d914db2e7865a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 15:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61df4e2512c157e5e769383e2a8d5b0d SHA-1: 825b71d27b4e39c856304529fef2a8ded18fbc32 SHA-256: 4c1d914db2e7865a3676c50881a116d872dbd78c8f32540f2aa89dd66c37f45b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or lead to malicious JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://koovappadyscb.com/ckfinder/userfiles/files/kefuvabirapanogovojezux.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/8905972835f4482a94feda6ab1efb209/loxureluvimo.pdf
    • http://seabeachthailand.com/UserFiles/file/xijoteje.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c5310cf8---1880039504.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/nuxewizemovojitav.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/nifawokiwanobadazinufos.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/gugif.pdf
    • http://coming-c.com/userfiles/file/84280897557.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b34f7ce8ae4cbfc3548ecd08a2da545d/wisuvomuwuxivapuse.pdf
    • https://bhsbeacon.com/FCKeditor/file/94639126194.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b099ccd6a5f---rivogujik.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jinekipitilimuziteka.pdf
    • https://mgogs.com/mgfiles/file/67825007221.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/396f92843693c430aa481bae165ab830/mesinifava.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/xovifezolurukanilu.pdf
    • http://chnli.tw/CKEdit/upload/files/kafunilowemamuwerixaf.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f6ed65d3---43531008424.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b05c5bc18---fudevepisodudazix.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8e37eh78f6dmvd3mrmljhajhb3/43879760272.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4d446787d9caacd08c8815978bd6d894/94458964307.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=causes+of+the+american+revolution+worksheet+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1bf.bin
6f8ba41bd8cf1a5b68dd4b4fbf50460d6daca644718a577fd6d6ae42930f8737
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 16284 bytes
font_01_sfnt_off0000eb91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 16792 bytes
font_02_sfnt_off000103a8.bin
750ec2618be605fa01ae829a3723e6e676f841f3f797d8018c9a31e766d75e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 11088 bytes