Malicious PDF — malware analysis report

Static analysis result for SHA-256 158026bfe4709581…

MALICIOUS

PDF

103.1 KB Created: 2021-07-24 04:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51660f16816e7f56096f6de7d270d5ad SHA-1: 1bbdd903b703087eaab0366c5f44ac1bb6af22cd SHA-256: 158026bfe47095813dfc0443b4a4c5e5a2a14cbd8eabfcf4cf337a6163856dfc
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits social engineering tactics, including a 'ClickFix' lure instructing users to execute commands and a link farm pointing to potentially compromised hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the presence of multiple external links and the social engineering lures indicate an attempt to trick the user into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3320

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kirilmazbardak.com/userfiles/file/zetifuxibajapemuvej.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e3463304bcd12348e7c17a55ef30fe6c/45380144877.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd5519b6---90436996069.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf4fa5e5f---fokepakevetafekazi.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac619b885---kuxaxozizapovujo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/59ca9d0744f5c411ebc011fbd972e66e/badimuzulilarakakimepi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7eoimigjms0cdjln8meptj4sd2/43043536023.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072003f23e25---bezovidulu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/32346121756.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0470d5b70f886735688f3df1b65124df/sibupugurowes.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b64140cdc61---sifovaxaw.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/gizitolanekid.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff8542059---fopubovofonojurob.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d11d55c5db11288982f5a3d858f13619/80641659491.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a047dac9f8---52549550637.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7468b92438602ae59d3069c372c9c91a/bifogotorijobetalikejob.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/82334098892.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/715338h4ravkh1apph6p3b9mh6/dituremivugukesezepevut.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/41500776001.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/580ad444ab7221cec3d78345d6083fe7/pabinozonavaz.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/zuturesaxazuvenola.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2u24i1rcc8m0kinnb28utfjjab/76081316429.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/4c26bc966fdf5665b16db135647c7c9e/rebezoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=viber+free+download+for+dell+laptopPDF link annotation
    • 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_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 18336 bytes
SHA-256: 8c57f7f2cc4527717c51028b9bc8cd9b53c783b6825ce5e3d83c2fdfd1845832
font_01_sfnt_off000166c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C0 10520 bytes
SHA-256: 27426afff996af8725d71085f8538c3cfb9ec077703b0ddcad2f81aeb55e6b4d
font_02_sfnt_off00017ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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