Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51baba3d936463f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 04:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb3f572601f23b506137ff7681ea8269 SHA-1: 3e56b27e3fc5985c4cf133e7246484774d99ecb7 SHA-256: a51baba3d936463fc30bc40506686711d0d63f67f357d4adc301fce9d6a08acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While no scripts were directly extracted, the nature of the links suggests the PDF is designed to host or redirect to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d56538fee---3414624949.pdf In PDF document text
    • https://przyklejki.pl/userfiles/kawapovabiviremawalikuwub.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/67094308228.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/07475d4724f54a225d5c04fc5cec3bab/pufetonevorepojuzipabuni.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/wujotago.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/buxalusosulun.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/jijivowalar.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/91075266066.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/92980233221.pdfIn PDF document text
    • https://aneri12.eu/res/file/famomilevita.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6p1fa55dqdv5g5e26g64897u7/43300262442.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/87560712615.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/foworevakotifuluxutuxepe.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sixitarubevelomipur.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/14f00f4f58bf63407054cecf8a268978/ninowalufit.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851104d8b02---48056030933.pdfIn PDF document text
    • http://vce34.ru/attachments/file/20892595899.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f016b79dcd---vanavoxekezava.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45b04117de689b3564af12093b81308b/sofog.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/nozotevewokogelo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/53628e0772d5d9dda9bb4f4436bb58e3/89122779431.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/vixap.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/62795050333.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/71617135631.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/nisutekovefakotuduruxivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomi+ovarium+pdfPDF 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_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 16400 bytes
SHA-256: ee346efb6b73599d999058560e3df3a6b4f42be1e364dc4da24af149ab9dfb81
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 10460 bytes
SHA-256: 138b36afe69bd06fe696a5e04dc0147054cca47cb342845d1432e3b863d4ede9

Open this report in the interactive analyzer, or submit your own file for analysis.