Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f008135f887960…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 06:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd393cb5c3cae42ca457504ffd5f53df SHA-1: 88d7e79f8bcb48012a8e9e8e48c59529b7b862e7 SHA-256: 46f008135f8879603a24843035a6106bbe3e665788f0d42e65c1ff61dba9121c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The primary attack pattern observed is the use of these links to redirect users to potentially harmful content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vicc.huh.hu/UserFiles/File/vepitudubigadobosabew.pdf In PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_060333.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914103737749664.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/71069468741.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0046bad3b---8041120631.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/89857945854.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/penanerobajoxekozutufefod.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/movazozekebojuwajibu.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/3846466594.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/22155164220.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b4b6b760---31499215415.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/vedakanepe.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/lunulapivef.pdfIn PDF document text
    • http://gardatrans.com/content/Files/39464114704.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/xisaxewenodumavesaxu.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/23680972170.pdfIn PDF document text
    • https://xenonsvjetla.com/files/sabozusomunexizapedu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mivatupozixarasor.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab12edcd9---52079724954.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/63095960057.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/zupubidoxesagafopumumunab.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/16626074421.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/desumofijen.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/xatufota.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/81267982762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+group+message+on+android+with+iphone+usersPDF 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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 17068 bytes
SHA-256: 6c24609196363137dd46013f36e4ed858d247f344409266bee533d3764de1f7c
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10972 bytes
SHA-256: 9237a604752c34793f6ca003a7b617c9e131054c74308c7ba4efa90a6f3192b3

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