Malicious PDF — malware analysis report

Static analysis result for SHA-256 44078e60ea203b2f…

MALICIOUS

PDF

74.5 KB Created: 2021-06-27 12:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0913d52bdbee1daab0361e8006c154c SHA-1: 274b9c2d5bd9c87901d29421e4fb1a388d13c65e SHA-256: 44078e60ea203b2f4dad3cf05ee36e9555adf75a357034faa6c30dcff3405cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads. The embedded URLs, despite some being marked benign, are part of a larger network of suspicious links, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself contains links designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c452e0db5306e6aba6611e38ca47fa70/38438087504.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2ee47cc5d8b89d5f863752f527323ad1/nitabuxonukupifumegodid.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/04b6c806fdbda72e336180933e3806ea/81242723198.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94216677---35111787537.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2a6127f7e94a1583322e2fab0914d107/45183691911.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/mejidofug.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/40034782435.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zifaxi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a44347329b8---supimipireju.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kuxilu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/60e615ae710b64daf351c3856bbbd384/62179477042.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b536018b35542304b2f46781e96f9ac6/61003998415.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/ripetovomekor.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcdd893e5---zuxafapabebetusurotur.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884481261dc---18846376557.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xofexutegetozokisurififok.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afd0a8f85---75621056387.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/toxirokipumefonawoxumepu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f655e98d4c---bumolukewipenasuvutizi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832404b909a---nujexetebenunajuvovikus.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98dce5d53---ronupipotipikoxagapuvixa.pdfIn PDF document text
    • http://ipceurope.com/assets/file/10997316695.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/20748927473.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b8e61080---37274902667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mansfield+sheriff%27s+officePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6833917b3454d0e3849783bce51472cc/kofosisa.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 10504 bytes
SHA-256: b36269ba53b7b3b06e7334c85b7fa493ad0590e7df6122a088899f5c326842c2
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 15980 bytes
SHA-256: fd7a130480ae0dce64c52651772def64a306b238971d352e195d9d1b89df520c
font_02_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1