Malicious PDF — malware analysis report

Static analysis result for SHA-256 2643613929dbe33e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 15:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07f7b636659db881c08f306df9b09858 SHA-1: b929fb3670fd47206290077989c8da74c5cf25e0 SHA-256: 2643613929dbe33ee079f9b17ae7ba8d33e1c323368220aee9d6d3804354df3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=infinite+flight+apk+latest+version PDF link annotation
    • http://rasmesafar.net/basefile/basefiles/danakezakirezom.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614211ffc5d4c---80832337228.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22715772060.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/buvilibabukoweweviragobor.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fibixivujuwokuj.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/duloso.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/lufizorowi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340963d6bdb---kizedavusejizuf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161380c9d807d2---70255104506.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/1114737162.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/1551918864.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/zasibaj.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/60740510998.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/rijibivojitevoviwazinenuk.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/99488596111.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/roliw.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/morivojuta.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/71825028388.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e8ee31c1---99828153782.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/45398057552.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/38944287743.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 19648 bytes
SHA-256: 33830ed4f440aad5a5d109ec2b4a8b4e9962edc1eaf8d493ef65c96b5b94346e
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 10748 bytes
SHA-256: fc194b54928d2ff9ad1dda39deb0b17f4e861f1ebc8eca78a9fba4ad926f7fcc
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1