Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31e7ab0f4e8fc5d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 23:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48c822930278d84e9048f1df7b2a38fe SHA-1: 4d648bbdf9a909d0d808f0b1b4aaa0e557fee201 SHA-256: c31e7ab0f4e8fc5d62f5554032e824a86bae9e851e3758ab6fbfc765cbb4e619
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised websites. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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=adb+%26+fastboot+tools
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bonotat.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/40934373816.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/dajer.pdf
    • http://chrislahoda.ca/userfiles/file/65559530487.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146700d6f696---19492753317.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/84975089369.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/pinamupubut.pdf
    • http://resortvillairene.it/userfiles/files/lenamasegaxoxudujinafoga.pdf
    • https://amursvoidom.ru/media/files/takewatumuwelugozi.pdf
    • http://riverside-plaza.com/upload/userfile/files/kobitidimukujube.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/21589179070.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136953e124d4---17567356575.pdf
    • http://rooptex.com/uploads/midojinev.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4b64a01f---govogili.pdf
    • http://hyunsin.net/userfiles/file/rubulenijenexal.pdf
    • http://hoangnamjsc.com/upload/files/jivobareki.pdf
    • http://tetraeng.it/userfiles/files/vexozabavubesepuresij.pdf
    • http://rockefellersgold.hu/editor_up/rutepululugorix.pdf
    • http://gwtcs.org/Content/uploads/files/83078775223.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/8348803779.pdf
    • https://searchkar.com/ci/userfiles/files/33513424570.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/wanoru.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/6322583051.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b642.bin
eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 16348 bytes
font_01_sfnt_off0000ccb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 16792 bytes
font_02_sfnt_off0000e4c8.bin
e10baca8c0ea047f4340d524eb09d199879406042fd7803f389c6e7cba5b07c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 9336 bytes
font_03_sfnt_off0000f88a.bin
cbc0d7d366a252d5b953fb316283bf8e187f3bed3c3f5981cc090889075c2668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 20480 bytes

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