Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aca112511314b5…

MALICIOUS

PDF

150.9 KB Created: 2021-07-29 23:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9154b8bb43c8722a555ef1598d8d3551 SHA-1: 739ce355ece49946ada227994652190bbe0e71f2 SHA-256: b6aca112511314b53ee73f2f4bf7fc393c1a2c336fc0ec46d24fe6859f640d40
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple URLs hosted on potentially compromised websites, likely to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://robwalker.net/fckupload/file/wemevapaxopinoboviruvasit.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e5947d25f3da8368c659b71739f2b526/89560195618.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/621d01578053c0755dd64b9a72b366e1/27607351292.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/401ec3dabb6bf3e4d92267d221ab702a/74408563772.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rorixos.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/34d9f086cc7cc34b3aaa9103dc696823/32841121083.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q7lmklq46qcqvk9tbrotpj7j3c/42289836878.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d48054a70b3c1685187ac3e40678cb3e/varoxadoj.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o8vlc6ferca708os6caqdb7kur/35001115184.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086789c6a379---81808779563.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c584925dc70---zigitarajojiniwi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/55758969062.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/ninopexez.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/i2q37hbvnbqklso10nj68oc6jq/20176791828.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/31650791503.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2748e382ee---perurunidam.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/563a33201c748923a6bae10f8ec57b3e/bokuxevuwomar.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ce46bbe8e022bfe6b78fe9be04d2c92a/36830599180.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c47085f88ab49ae3737dfde0beac3cb8/62419931431.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kinofagabetulolonoxi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/55511852273.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5491d74e32c64bb837e3bfba34f5f320/fopolebuxekifasijula.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81eba8460---widuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=java+8+32+bit+old+versionPDF 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_off0001ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA5E 18460 bytes
SHA-256: 06cd1b48622b3ddd31807bf692f009c31ce29071eca597a928b057a294c587db
font_01_sfnt_off00021b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B51 10940 bytes
SHA-256: 86e77c16d52b01264b2fee03e53215eecd98046c96f3d125c6cd06175685c246
font_02_sfnt_off000234e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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