Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa47529103219eb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 03:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bb98cc00e582754c9ef95721119e024 SHA-1: 28ff22caa94846f66503177ab544e0e7c7504c38 SHA-256: bfa47529103219eb3ad5557c45001afbd5d6d5d631a9e4b3a4eeb684f01f2981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The embedded JavaScript, while not directly executable without user interaction in this context, suggests a potential for further malicious actions. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=change+whatsapp+icon+color+android PDF link annotation
    • https://smg.bid/ckfinder_userfiles/files/gafonavotikix.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/25638833623.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/75984650351.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/17331713447.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/18380271644.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/dererisaj.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/44052550048.pdfIn PDF document text
    • http://koala-al.com/d/files/jozojegumazasubo.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/relatiwisujo.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/43702411870.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/libamovenisunikixefi.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/70166159101.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff4026f8a---98612792007.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/80457034678.pdfIn PDF document text
    • http://sieuthimayphat.com/ckfinder/userfiles/files/pinezizifoletal.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/zategebawufonavapi.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/5395646474.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/wateragugekurene.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9994d5ac---gadet.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1kd25rv442uabvn78nbtbldp2/puzofojofijipuzafuges.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/jufuwutib.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/jabupulewetuvi.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 18452 bytes
SHA-256: 8c38ff48df8170640028f788cbd8df3bcc0dd6ec20c8e47318086b048f064c62
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10912 bytes
SHA-256: a5ccef090cef390790d4b4a1d6ff7e0ee3ae6923fefb2e441a7ef08edb9d63ba
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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