Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea79ba4bb475d2a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 17:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bffd283032f7dd12b1d474f39537ad6 SHA-1: 5d8fc3b8669493eaa1ba5b5d7830b1d27fef9050 SHA-256: aea79ba4bb475d2a7802772969c0cebc0211086f7844eb6784075d856c6a6b09
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 multiple compromised websites and PDF files, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and compromised CMS upload links supports the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bvphcn.bdata.vn/upload/files/33914897137.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/r17cstktrvoc33rrnjvr8mh7cs/xazudoremo.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kipisuf.pdfIn PDF document text
    • http://woykoff.hu/upload/file/bozaw.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/98146868146.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/79463669405.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xejikaziverulanavofu.pdfIn PDF document text
    • https://kawanmto.net/contents/files/wawovufesit.pdfIn PDF document text
    • http://methese.com/upload/files/65741109060.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/1210627863.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/robefojujavad.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/63394817426.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/bikafelejubafewijodawid.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/pedukaxemexefuzi.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/22785817146.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/379578fdb41c9f8a3fc02a0b763cedb5/xenonamovabu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/7935597784.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/wuwufafuxudivimilisabal.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/winuxafoserot.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1865f53b---mijedasij.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/19502920560.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/puwasomu.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/vuranejisefaxudowisolidot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=which+is+the+biggest+country+by+areaPDF 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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 15404 bytes
SHA-256: 6373b69f11dcd4917796e735ebcb87966f5d9d322290219692f8af50eb86171f
font_01_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10808 bytes
SHA-256: cedfd89fce70de05be078c6095451c0f2d46cc646bac05841a6763c474252ec2
font_02_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1