Malicious PDF — malware analysis report

Static analysis result for SHA-256 971e867912f36a17…

MALICIOUS

PDF

101.5 KB Created: 2021-09-20 08:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a329bdd3668975fa54bb3f6b47d9594 SHA-1: 3173dbe12c5703d54ab149ddea87c860f4768fee SHA-256: 971e867912f36a170d1ae3437d1edd2b4f7086a00d5e4aa08a1fcdfd600ae6a6
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs that form a link farm, many pointing to compromised CMS uploads or disposable hosting, suggesting it's used for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=cadillacs+and+dinosaurs+download+for+android
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161339e1160654---pogofiweg.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/vewolifofusilawev.pdf
    • http://alemotta.com/resources/original/file/7233070368.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/xexidojazokubo.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130216ff0d94---nowaxugapupuw.pdf
    • http://goref.ru/files/file/famugexozu.pdf
    • http://dtjxbpzx.com/filespath/files/20210912123238.pdf
    • https://towa-aaa.jp/userfiles/file/50105322.pdf
    • http://sevvalturizm.com/rsm/files/85188040991.pdf
    • http://dulichtantai.com/files/uploaded/files/97479925500.pdf
    • https://ppkh.net/userfiles/file/68872607717.pdf
    • http://boldogelet.hu/media/62495506462.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dc72d19b---67821277041.pdf
    • https://leo.tw/upload/ckeditor/files/70566097057.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140958f88626---fulupazenoruzo.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/79088479897.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/43430684751.pdf
    • http://cpghollywood.com/userfiles/files/bisifogunoxewojul.pdf
    • http://cosmoscm.com/contents/files/10500840137.pdf
    • http://rs-entp.com/upload/file/fibuvimulufudironupavor.pdf
    • https://tattica.byespresso.com/app/webroot/files/upload/files/30197992684.pdf
    • http://clickvay.com/upload/files/sepelatadavazop.pdf
    • http://realcomfort.ru/content/upload/file/39245777277.pdf
    • 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_off0001236a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
font_01_sfnt_off00013b81.bin
64d3165349ac0bd322478be95e7503dfc6a910fe2d4b18002382809d50b2c89e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 10456 bytes
font_02_sfnt_off00015361.bin
f49f2706cf759b5cd9c99eec1fd36872a1cb710a46588cf22e323fbd653ff688
pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 19980 bytes