Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c392c59089687bf…

MALICIOUS

PDF

86.6 KB Created: 2021-10-09 22:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5f1e84d703e7c943fd2e6b8033b1274 SHA-1: 9a8b8b80c10b3799233ef7fbdc242b9b6798ac5f SHA-256: 3c392c59089687bf70c5312db572f13bd2fcd584704646ab2b3eb66f3ea4f6f0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://starfoil-mail.nl/uploads/wysiwyg/koxar.pdf In PDF document text
    • http://casier-a-bouteilles.fr/file/55866737381.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/19418207514.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93307004832.pdfIn PDF document text
    • http://asvpp.fr/pdf/86457155515.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea600781c---4084840002.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/ditazadaminukojamebe.pdfIn PDF document text
    • https://pratham.one/file/83141275437.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/welog.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/tiratawesegisatowu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xetip.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/75333800089.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/46220410848.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/punoxuwap.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/wibidijufixuxipesuduwo.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/gozaxudatumupejes.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/wovofik.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/98329921071.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1lp1ps6ua1q6o3mcso8vqukmg7/lovekopot.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/6495880810.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/fisevojuvixopixabarejug.pdfIn PDF document text
    • http://zamgph.com/uploads/file/062145021284.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pavegorimozenajevufipal.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/kakekevodoge.pdfIn PDF document text
    • https://langumeistras.lt/i/File/podosudukigemetupi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bfb84e13b0342cefba6951112131c717/4616518593.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8mh8sqbb97i3ohfqkpoq6e0f2i/bumilonawozapusunukagiji.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a17bcaf35---27694917761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=christmas+chocolate+moussePDF link annotation
    • 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10520 bytes
SHA-256: 68d5519111d00a203038cae2ce7a44f084d9d235a284bc3874fd288cc934725c
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 18992 bytes
SHA-256: 5113067c2a032b5b852ceac5fefba47492923b602623e7bbf2aa17205502a607