Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7973cc8acb0db44…

MALICIOUS

PDF

98.0 KB Created: 2021-09-01 08:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c9e3b2beb9f80e51964c5c2344c98a4 SHA-1: 494d0cc2cb38de589c7979313cfb4b42adb6d904 SHA-256: f7973cc8acb0db448c7298da0e0f7b5d15f903ac5ef9eb0a203974a88d731b96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, which is a common tactic for phishing or malware distribution. The presence of external URIs and the 'callback phishing phone lure' heuristic suggest an attempt to trick users into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=barriers+to+communication+background+noise PDF link annotation
    • http://ceskylakros.cz/userfiles/file/defabepipelamolo.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/rikebuwijixovafi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca181bf1e10---pelazazipetuxewe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608615ec5f97f---35714298291.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/31486013773.pdfIn PDF document text
    • https://educhina.mn/editor/files/25925440176.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jixipatuwirevupujemis.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/64728317566.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8bnobfutqgmdbmej61e520cncc/nukum.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ae466891bedc840f91d9a02a2ccefc6b/90669214376.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/87ukq6o9o2tlm3fir08f77udq0/xobamajikejegomejibogiref.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/00730be23be5ebf8bee62d1d7e1d6025/35119124358.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3ecb01e8---nafukabidufamekaje.pdfIn PDF document text
    • https://mlspoland.co/files/file/58633728302.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/55947242955.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/45391061191.pdfIn PDF document text
    • http://vejwun.cz/images/35057007360.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/nujipogazasigetib.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4f6471c7---24577750115.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h20rjftq8215fjlhrkccd66l62/tesezukutudike.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/70998519494.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/revavodosebupusogasawepik.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c84aafe14---32752562840.pdfIn PDF document text
    • https://majubesar.net/contents//files/30340874449.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6acc059df7---gexowaviwugofa.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/54715629862.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_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16960 bytes
SHA-256: 2484b87232c8ac7f20538ed361ab88d68193149b0a3d4b9c698987c25cb89326
font_01_sfnt_off0001474c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474C 11052 bytes
SHA-256: a7844f18603e76b22058b0159c90154d4099c5effe438848c38b61e5a6e04395
font_02_sfnt_off000160dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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