Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cdc4f59a8172b5…

MALICIOUS

PDF

76.7 KB Created: 2021-07-08 04:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5e51080a8b97a921b823f23c81acc497 SHA-1: e1024e3297f17c416e100738d9ff9aff39c80c20 SHA-256: 76cdc4f59a8172b58350148cb4647665c1a48e25303dcf9436d3eb1068562196
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. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, making the document a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608097a60bf29---vovamu.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l21lpqah2scm9au5epnjdepbpj/wujubejojosupiz.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57d08ef77---95756215911.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lobavemawudapufa.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tupari.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/70829031004.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606e850acf19c---lovabifazetovovezifewez.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/mowesegodasigugupawunusa.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/mefodakirega.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/9b2465fdcf1dd7ef429e7663a932b3bd/853878439.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbcb2cf442---sukuvoxifufijizunek.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/7300490147.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/laqg941jr2fg7a3gul6seretv6/2777715595.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/72ec44a34650afca67b0c5daa6e9fe91/jopijilabaxapaze.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9cb3db4f2a5a59a8b92c4eb6a250f62b/fapinonune.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kodivari.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0eb9ddbe2---juguwizezijakomibemutoxek.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9a1290af---xupasonas.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/esd64lu96l8hnqbi3ufchad8e5/labitefesitiletoxifavapiz.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/rubunafunu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/wokididitaxezibufelafugo.pdfIn PDF document text
    • http://biomisszio.hu/tmp/radufetozilawik.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aca7497e46a---84164861787.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aec20e81408---tipipewivavube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=to+be+plagued+byPDF 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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 10320 bytes
SHA-256: 0fdc06b046083c2cc19df140d38c522d3a052105350b4d8961bb43613e8b4ab6
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 18024 bytes
SHA-256: 179743a4827024b8b3663ebefb966651bb3702f017912275b2e6932c456b0d24