Malicious PDF — malware analysis report

Static analysis result for SHA-256 888bfcc7459157b2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 21:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25b910c4367060bb6b1d9b0876183952 SHA-1: ff21e4f8552c00d24e4634e44f70db2a6c428395 SHA-256: 888bfcc7459157b2c22f0ab49eae0022380a9565345125b142be7823dc4cbc23
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on disposable domains or compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yuilchem.com/userData/board/file/39715218517.pdf In PDF document text
    • http://stroyvodservice.ru/upload/File/9440660758.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/zowezunaxatasorilibem.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131882f04c98---58509529378.pdfIn PDF document text
    • http://c-amc.com/upload/files/7518412712.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/lokoxunixegoburexobime.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/pifosobizewoza.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/85928983660.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/wosutirimopepasuxinum.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/mupolobavofidomawewa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b0b539bf---numopazedinezani.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28290896067.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/93834093265.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/47577648782.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/peleludorunom.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/jabopeduxinokokaxeradetes.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/35423421727.pdfIn PDF document text
    • http://packturf.fr/files/kasawexuz.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/43063760979.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f96488dfd---31524421165.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/94740737782.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/2763770851.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vurisosusimatugisefimise.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/65797429110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apps+to+know+wifi+passwordPDF link annotation
    • 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 10472 bytes
SHA-256: 3130b745f1d6d26466d03d00b0f0eee200c2130cff3760be0362cb4b7f7b1b83
font_01_sfnt_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 15248 bytes
SHA-256: 34fb29c15c52d68aa7a09bf844785fe2757e980cb472d0068094317c664fe632
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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