Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd21f06ed2bfccd8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 12:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4674737b6ff77404bcc9709c9e4eaa84 SHA-1: 8e8bb2923c57d993577f15c008783b781eedc2b9 SHA-256: cd21f06ed2bfccd8638786d700192541d98bd36c9c554d27c58445ab93c163cc
204 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of LOLBin tokens in the document text further indicates malicious intent, likely to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=where+are+apps+located+on+android PDF link annotation
    • http://desushibar.com/userfiles/file/58427567707.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51372860435.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e727e184db---26700277422.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/watibisetukajol.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sofoxidukuvawepexenowifuw.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/92326620324.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/fijobaraveniw.pdfIn macro / runtime command snippet
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/woridadolixixixamite.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fafbded3224ecb49da08803f416c3666/sezowuliwigitodeburusivo.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/42627769688.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/83965155242.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142549a97f---vujarifefedudetoletuxaxus.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6egbjbmtd48c1c436n4kjjsa86/42440737636.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xulebomodinivolazan.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xepak.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/70422627995.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wusuvizujadazumuduxeniwu.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/84472455167.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tudobozun.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sigiwe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pitajom.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161418548b08e7---dasosirapinupadofemik.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/66346893045.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191011191012.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_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 17784 bytes
SHA-256: e250241d6d8e469f9ec6501810dd53a381779746450de662f71d99c213c90edb
font_01_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 10604 bytes
SHA-256: f01462a3e9292a3eee9fb6de6ef2f70fe52015616ac444352d84701bbde3398c
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.