Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8071f1eb501983d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 08:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a087a876fc8e52da4d0f30b1e88e3e7 SHA-1: f323d9757e5ae571b84d1589fcefe547c228d553 SHA-256: e8071f1eb501983d96ccc66ad59fce236a4fe7757506c093f48cca555a91db04
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=android+real+time+strategy+games
    • http://tndgdemo2.com/ckfinder/userfiles/files/1704020745.pdf
    • http://kimhoatra.com/upload/fckimagesfile/fabipu.pdf
    • http://1night2day.com/ckupload/files/kigirebopevo.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354f215ed8f---vezixufafovo.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/91358901245.pdf
    • http://bud-drog.pl/userfiles/file/9187129036.pdf
    • http://andreuma.madteam.net/ckfinder/userfiles/files/gejibimubojirikub.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399a05ceac1---maxevakonibezanikogufegus.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/77279026587.pdf
    • https://radekslodkiewicz.pl/files/file/52232219331.pdf
    • http://trongtinpc.com/luutru/files/sotumunitusubakediwuga.pdf
    • http://praconsulgroup.ru/pict/file/sedirufonovawad.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f15579ba---gazukulifituxagikarix.pdf
    • http://cobmedia.hu/include/98421443437.pdf
    • http://szyqjsj.com/UploadFile/file/20210910115510933.pdf
    • http://otvorene-srdce.sk/userfiles/file/45513642774.pdf
    • https://rowadalbyt.com/userfiles/files/98783288935.pdf
    • http://tuanayapim.com/rsm/files/5135962553.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/19171019870.pdf
    • http://uceng.net/_UploadFile/Images/file/konatubajinawub.pdf
    • http://skisun.it/userfiles/files/xudibe.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b74509c4f709dbbef2a10b16feb0919f/pefarisulutozomi.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/gelidufoxekejabixivigujef.pdf
    • http://abnicum.ru/files/file/fupivilufilulijojorox.pdf
    • http://nsk-nalogov.net/upload/files/lafuvakidewozetujepivel.pdf
    • https://wonwon.taipei/photo/file/90889159048.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 16792 bytes
font_01_sfnt_off0000e8f0.bin
45a39bc84f03589ca18f61e7061aa349d7284f104e1b334ec7360dfd6fc6aeac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 10688 bytes
font_02_sfnt_off00010137.bin
0134d645d3a64aa3d6baba226b07c7b65a3d6e913240a3f770757be74b3893b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17612 bytes