Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1e171f60a1eea…

MALICIOUS

PDF

92.8 KB Created: 2021-09-07 17:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccf88cca7b25a5b0ef3760f8fd13613f SHA-1: bbdced7ad75fb2183b3410efeb63bda186e48345 SHA-256: 19a1e171f60a1eea9acb111bc2f47f8811b0e228ba58dbb032d2525c411c4aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://thetestmag.com/userfiles/files/kimedotarabinepa.pdf In PDF document text
    • http://truthtube.com/UserFiles/file/9845061451.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/84006835101.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/jawemozufibuzedekufaxut.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/42564244538.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/25109088586.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/43454212390.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/301456259199.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/54628421090.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/37986629900.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/90220458198.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/2154723093.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/45610010438.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079582d77ede---75178654825.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6529290b99---jabigogorulixederi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/dovujutuwepimajopuxaxo.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/10052686042.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905aab6ab17---dotilafagoviwu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/99738176501.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9n2erofpv573kg0gf0mtsbmf2c/52888088164.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9b0a26233d24bfdf2f4f4fdf891ce646/fubapukodeg.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/tutirowedajewileziwoveb.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/jazemozab.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/32049261852.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/mikukemagor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=class+7+math+solution+pdf+download+bdPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d4ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD4EF 17104 bytes
SHA-256: c8d57f2de1efa1f11b1e16315a70300efe9a64eb971c146ebc9bb3c68b326016
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 24140 bytes
SHA-256: b85161e1b04e98f9bdaa066f5f61d8bfd26260df038f4dbd70db7984631f65f0
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 10936 bytes
SHA-256: 75c467efd4a6d1592fa192d61ec0164784495bccd9dbff6a858f881e7775657e