Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439fdfa93e784ec…

MALICIOUS

PDF

89.0 KB Created: 2021-07-23 01:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dff8328d97b3a4bc170a3452421d292d SHA-1: 6147849ba907b5cfb4be0bfeed53e947c2c950f8 SHA-256: c439fdfa93e784ecd84c8dd4a6a222a71184f1820e5056f3a7ab6e256948e5e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it is designed to lure users to malicious destinations, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a123236d3e---sowajemepotuwel.pdf
    • http://szkolka-wiercioch.pl/files/file/woxipuridap.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc0b329fd---duserusim.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eef6148b---48708335731.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c707eadea---20808451880.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/zerisemixadori.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c057b08cc7a---65692763397.pdf
    • http://adaviestransportltd.com/userfiles/file/pasogubiludenazejufuge.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9280e8be---67156902652.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaff6e8f87---16986397040.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607755340a561---pugixopiwogarus.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7e40d4c208f646dd1c5654948f7fc47a/gafubavulo.pdf
    • http://maciejabramowicz.pl/upload/files/file/doxujisem.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723447cd92c---jirebadowakivene.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/insu0u4nnv3ojspu0uf600n4m1/maxawogurakitejanof.pdf
    • https://vivekanandbawwa.com/userfiles/file/95782197462.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c2cbae2a---sawijoseluv.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3640960a3---3577266698.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40e605d2fe---kegodi.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cee7b87---10306747619.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/sosemukadenuzomul.pdf
    • http://meadescafe.com/userfiles/file/puvamukepabo.pdf
    • https://hrmconsulting.biz/upload/files/suzex.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/zopet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=two+gallons+equals+how+many+quarts
    • 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_off0000fa4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 16792 bytes
font_01_sfnt_off0001125e.bin
964a1881e2bcc0222e77c134fd6a106f41a3dd6177b848df6a1eeda85a057676
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 16344 bytes
font_02_sfnt_off00013c98.bin
e4bbd405ec607ec3a698382cc38d316d9a0aa2363802c541283a9d35f509c02c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 10872 bytes