Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7f86b7532287d3…

MALICIOUS

PDF

85.8 KB Created: 2021-08-26 06:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 221d15b24f8645b0465b2825a384c583 SHA-1: cd3d2d61d41466d82806fb17994060d491de6d5c SHA-256: 5e7f86b7532287d356b73d7fd306f1f25e839ea2540bfdb19d122bfb18982dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or facilitate phishing. The presence of 'utm_term=adobe+photoshop+cs3+free+download+with+crack' in one URL indicates a lure for pirated software. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the distribution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64c01874---vatusotabuxozofutusewesi.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2523752ca---buvilemukuzilolemaviwanuv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b504bb00e4fff3ba3e11da2fdebf67f1/64891225617.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/10996265612.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/6691104986.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/98965072539.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/sozagobuvusitidasop.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1pc2qi7v6g2qhgc67l3m6ftlmj/xosevuforoxadesoterepa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59fe22f58---86522965100.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3bbcec45a0e7aab827de2436f7d0a82/97012756675.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/u4pfc3u9o2rb9ll48atk2a9nhv/17918396704.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926aa59fea2---mikapefowitepodebe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tp3818f23hn527e5d53unsm28s/18820121154.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126247d62214---15917274265.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b96da3cd---vovaporujadagudunexe.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/830078916609e35ef3d0b8.pdfIn PDF document text
    • https://pmms-online.com/assets/file/28487960105.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/8628518358.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/lodumakimiraxe.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210801_91458FB663D26B65.pdfIn PDF document text
    • http://africareview.in/userfiles/file/wafonim.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/17554534780.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/51552910155.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210822050102.pdfIn PDF document text
    • https://norservis.com/files/files/katuxuraxoxewebatezopapoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+photoshop+cs3+free+download+with+crackPDF 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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 17148 bytes
SHA-256: 550511780bda4b12a20ac0b91b770dae46fe1da260891f3e4e090c7a9e147cf4
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 11188 bytes
SHA-256: 22ba0ff44d6912573a6551d9df5b96f7d606afb763b347394819a824896bd8f4