Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb925de3f0b70763…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 06:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33fe0d422b624d23f0b934de0ef7a2df SHA-1: 7289585efa15eb182a2c17feb9177b1dd2c872e3 SHA-256: bb925de3f0b707638c424d0f8b02d46e07786d59b9d4bec1981d40faf2263fa1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

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://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/54919992840.pdf In PDF document text
    • http://picassogift.com/Uploadfiles/files/18667449507.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/95389974930.pdfIn PDF document text
    • https://ccskin.com/geektic/files/17412993863.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/juromobubaborodu.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tatadefu.pdfIn PDF document text
    • http://favourtec.com/attachment/file/pixirelel.pdfIn PDF document text
    • https://seikai.jp/free_images/files/setawez.pdfIn PDF document text
    • http://megalaserasia.com/upload///dedoxeboxix.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0n962i7gpljms4s8fgrn2jsk4/wedanimepanederalenipudip.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/mixebebo.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kituz.pdfIn PDF document text
    • http://aweibel.com/Photo/file/poxarubetagitid.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tavakufibezosekom.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xabob.pdfIn PDF document text
    • http://receptlap.hu/files/suvuvuzatogogarukulimuz.pdfIn PDF document text
    • http://screen.by/images/file/loxefagexotemitowonafabo.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/dijogexotopitaz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/92765492312.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fbd0f410700ff03386e10e55b2c8ccd6/21109683518.pdfIn PDF document text
    • http://a899.net/userfiles/file/vapemurabov.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/26798639389.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/50041519133.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210915215648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=note+20+ultra+vs+iphone+12+proPDF 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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 15720 bytes
SHA-256: fe4c7b0ce0bfb22b47285673e88bd19ba86b204e66f905a3891d6e824f708656
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10784 bytes
SHA-256: 1d011b54e9e3bf92d696c0bf850cacef116805f9783e313cb1d17356538c2712
font_02_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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