Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3218eb901c8b2b9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 01:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71d17958bd8c0a92bbf33ee5f2c5dfd7 SHA-1: b982a950bf1bc3b438a4668097dbd2898c6efa14 SHA-256: e3218eb901c8b2b9950e8abd088f98f6da3d81af881998acf15bb3932c1afc7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 upload directories. These links likely serve as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082811869b20---samasanenepaxuk.pdf In PDF document text
    • http://fresh-j.info/images/uploadedimages/file/38851721217.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/54kufs5fmu94m8mhk811vqvck1/49346731187.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tegora.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076639c48cab---dunoxisit.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c773cc47a32---14817184538.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dmclkujmgmg5guqo5210gdco01/63203123381.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/wikuwozidikepipija.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/86157e100a3effae4d43a545a47294df/66936139479.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cb4a5bc7356c41543cd794f708ed8df1/76390365833.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160855f1b7ecf7---88916690920.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd59a40bd---wizabelidivosasasamoj.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/40566380754.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/rabikekisesosiduvino.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bixupekibawunozaxurifijif.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/17606959609.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/mupolavelox.pdfIn PDF document text
    • https://people11people.com/uploads/File/welos.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fedanetuvebifaxabipefaw.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c8db3417b9a731d61528381a32ca4040/befapuduvupuxubitix.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083482b0a833---gamiriwosekilotogu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84ba74788---59572082158.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1623557518493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=average+distance+56+degree+wedgePDF 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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 10812 bytes
SHA-256: 1e8febbc084c878b7522fea0d03cb4b415f1971d1e1766872143252957357e2d
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 17336 bytes
SHA-256: fb383a927030f1411129d5f286538566b80cf3a003a53605635844c851487b6c
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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