Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38d040cc115f381…

MALICIOUS

PDF

102.7 KB Created: 2021-08-20 01:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53e4a90a7a127c63d064306c29d9395f SHA-1: 6c5515403fbf95ed82a682fbbcccfe1fb4afd8c5 SHA-256: a38d040cc115f38178d0e3d64c4fa2952602802bb8e1e6a1101b4222dec15191
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6a0aa1163---5834864459.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160717d294e61a---jiriwifalujewajofezuke.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/18754422283.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dikulefuxixaxuluxewum.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ojtr0b3i3qpspm4mbqedrrifcu/xafazaguwukubaveke.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/38603571891.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/75896082628.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/savolewaw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9595683c---xigilugatewaf.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3baa7ff02---60861704594.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tamesajefusetexok.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106240443206110.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/betabo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d45551407---daserumatopajerutatutupum.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/128925425964cc0e23599d42cb2e8bb6/sazafomujedip.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zuxapivametezivikijulefu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fd6b5351---puxamud.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/fojajumunikus.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/17518285004.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc00100ab---batixosokaravufupisug.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/fesulutarudazidenu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/19760614397.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/10699117751.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/24189679535.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ad31de44c---24402297260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=eleventh+hour+cissp+fourth+editionPDF 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_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 10704 bytes
SHA-256: a35c7ddc96976ea2f67c304c36e82ab5b9ef0ce66cf64d3b8898557c32f3811a
font_01_sfnt_off00014321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B33 18312 bytes
SHA-256: 2d40c30c858256e6a966cc1505cc9e62a17b517ff5859aef42944efe741fd8e5

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