Malicious PDF — malware analysis report

Static analysis result for SHA-256 e856f021137ef7e9…

MALICIOUS

PDF

119.3 KB Created: 2021-06-26 23:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 061764dee2fb4fba66e868654e6b2ab2 SHA-1: 2b825b49507bb4de9e4a5ce7b516c439500aded2 SHA-256: e856f021137ef7e9b2cdaa5c34243e0df5ca29af4c409efcf8e095fd06b24a55
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://readandenjoy.ae/userfiles/files/fepevinejalafovovoz.pdf
    • https://penzionradvanice.cz/res/file/gimazizaximejoso.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/nisag.pdf
    • https://meesens.be/KrMee/Tekstverwerker/72426144689.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b696a77ebda---wakixuforejemawefefekezak.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/87788589530.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd32eec4a---14023605926.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e3bf2cf---megaliweta.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e7dfe86f7970c6e8c2847cfe6ab91d4b/jodonosifokusir.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8l71j2qaa11hlerlgf09ligb7g/wimifogijap.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/31f710ae36f634602506ccf1d2e2402d/10827988629.pdf
    • https://aimara-bg.com/userfiles/file/18586266773.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/04b206fa7b8a57d1ee36fb846c453b83/dosesujemav.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98a37fbcf2be2558f388550c4a63382f/13582953110.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210516123626.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0dolupdepo6hmkfd4q6cmm045q/84902934681.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee30eefb84---nokoz.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31a6020e3---82019824618.pdf
    • http://www.cerathai.com/image/upload/File/89870672367.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/051d237e2ba6f352d16c07887b3e1b73/88177980277.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/08b013a08ffac144d7008327b20917a9/52870957784.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/06fd31837e31c6ec58c65bdd6b3c4604/jolafa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=intensity+in+young%27s+experiment
    • 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_off00016ac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC9 16792 bytes
font_01_sfnt_off000182db.bin
9c5c3bb1d10297723732d1b8e1391e15a5671a892c5e07528d5880c4f87a1626
pdf-font-stream PDF embedded font (sfnt) at offset 0x182DB 20652 bytes
font_02_sfnt_off0001b8b2.bin
ffa0ba33d5af498d69943721e983a0a5daf5a8ba53fc23ddab855d834c6c3ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8B2 10688 bytes