Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4ba2eb886a01b7…

MALICIOUS

PDF

94.7 KB Created: 2021-08-26 01:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b9a7b2eec46eba4e6e12fb0da8decce SHA-1: cbe500cac04561923eda8971e777f21db5c8f531 SHA-256: 1e4ba2eb886a01b7d891b3eeeb6427281672f16d3af08f3d1a0d56075e7ebcc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The document body is unreadable, but the heuristic findings confirm the presence of a link farm designed to distribute traffic to potentially malicious or compromised destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f905da10d5---kuxoruwodanobibov.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ebf318e3a681086830eb7f803240637b/wobazejizilojajitojezosiv.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/32522163704.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/66628763558.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609447760ede6---jilaba.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b41fb7086---todakelulodubotozer.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/60653549128.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/javuxave.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca47f41b9---82651682526.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/lodujudewagevafateb.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b46385dd---75452462929.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/domakurifo.pdfIn PDF document text
    • https://dintek.eu/uploads/file/78223396066.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/408961aa8809ea6a3188e3c2d99927a3/sumageluzasinusib.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/78800768213.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/86592767326.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed22d22aa5---9019805868.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/85382287820.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/74635945240.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bf9565403---23525367471.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc40bac7600---gejuzezukafepawal.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ddd9f3c24---botobop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oif02dkg11kvfvls2jag7gk3s2/bedijidakuke.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/dateresekojexita.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/38096246435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dua+after+eating+at+someone%27s+housePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00012e57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E57 20428 bytes
SHA-256: e4d95224d3354a54c6e97c954e207e190871fe4fcc2e2665da5aceae7694cd39
font_00_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 10748 bytes
SHA-256: 0c2c79569643a8fe92101d2a60b2314aaaebd1cf8f1668c670cbce91a1268635
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17380 bytes
SHA-256: ccac4194e2c7f4232b258599105f1a9d3263a89bea9d5d98accd5fa492d4d4ee
font_03_sfnt_off00015163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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