Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ccf73eb34d9a6…

MALICIOUS

PDF

84.9 KB Created: 2021-07-27 02:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d974fb13c6711b386e1bac1d39d84ed1 SHA-1: 05ae0ed30b3da7aae67b8ba8d31409f61e8afb17 SHA-256: a86ccf73eb34d9a64b3a06a2c658591cb5686c49e8745abdbb6cbff65b4763de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/7iqbbgetoc2tj5cdl1qnkj9rk0/wogudezuwafixonuluzoval.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/96172741373.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f97cbbacd---buxabalesabazedadoven.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xodadefofupaxi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zuwal.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/zimasazijunobadarize.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///54104032065.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e182a0176---kosof.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecq82oulk26dvsvv2qp0rp3tl0/lufajokedumizasasalipa.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7f770f2be36c5ee7b66b11cbf14660b4/98104098058.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/64146721516.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/jobudodaxiwu.pdfIn PDF document text
    • https://yellowstonewildlife.com/39748477331.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caabe81a38---1784591085.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7dd6d945c664e8d3b97fbe23a18a93c4/3672794136.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/a643pu7tv5b1r719kq243qsgdn/tuxikaxenexibe.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629205427341919.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866bd9c43b---mipatitowesabuzesilono.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/72537934347.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/53285697722.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fd8514be18a9037b6cf11b492dcf6d24/97363261457.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ak62uhbt1ngtah8ns25nscb786/gewifeziweno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+lime+customer+care+numberPDF 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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10728 bytes
SHA-256: 43c6528b0cf636561bd6a17a80ad9c317399342a2517b6c6d293c59ee781db99
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 17880 bytes
SHA-256: 209294733760eac961cc5f7fc2fa6e37ebb7df4cccd9b776afc5212d6e8efded
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1