Malicious PDF — malware analysis report

Static analysis result for SHA-256 8798a2443efc518b…

MALICIOUS

PDF

59.5 KB Created: 2021-09-29 14:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 252cb1f78c46a1c32229db94a719decc SHA-1: bde3c0698eac6187c64a843c6486a1fb999a7dfd SHA-256: 8798a2443efc518b2ffa410caaa0bb20e022f19c8ab65f8863913c60a2132889
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+open+apk+files+on+android+tablet PDF link annotation
    • https://arvikabc.com/images/uploadedimages/file/sizuzon.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dekoxaxetekemufixaxakid.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/julokoz.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jutezuvim.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fecd7c3e08e4ab6ba3f26c21c0b96aaf/22866855737.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/3206590381.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xokizapiw.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/1351116735.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/54408291694.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/jemelozavi.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/vufogalugijuk.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/rimawosejiwa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b948354b2---84741680045.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/masijufileruk.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/zuzikulariwafexiwifu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148e63a7f134---82488167380.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/79634897285.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/jijigasiwanobipidimo.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/zenozojifotat.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/22875705525.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/pofirimaxinujipo.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/82934707219.pdfIn PDF document text
    • http://www.77ice.com/upload/files/67270260020.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/22869885702.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e0cdc515821a016a0c7f4e2a96194e1d/mogogabuxib.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 10800 bytes
SHA-256: 000e10853da5d2354b726575310695425212a8285f24307e3009256cdfa26bf1