Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd69d624d40eb9d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 13:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47f3a770eba805ad3d317e50e9da3fc3 SHA-1: 31b7ea3ad0d9dcb9bf6c8c7721833f9268897ecd SHA-256: 4bd69d624d40eb9d8ea27d0e6d639e7b6b189da7916ffeea2b2bb1eab19812cd
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. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content. While no scripts were extracted, the presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bjerkelunden.org/content/files/userfiles/file///rejenogituzakitofokugefaj.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/63ecf5f0f18fee970271a88daf943bac/foxikutogawitakafeduja.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/fetoporinefaza.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/goritugix.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/iig30u2ec5npugugmuap28r8r7/88989110769.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gixusimiruga.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/47402867994.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pepofigosewulisaju.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/48666761060.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210907181204890067149.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/dasagoxemipokevimese.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pawuwilaxozexarobad.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad21cc7b---93406029116.pdfIn PDF document text
    • http://rc-modeller.se/images/file///18739439511.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/94a2f841390428e41f4f7bb127705fe8/mepefiwa.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/18164472090.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/wixuxakuxobaxomuzovinuzi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7082be39---18559600494.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/pipaxarozuloroze.pdfIn PDF document text
    • http://soc-in.com/data/media/files/motiko.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/69650134833.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/jujosotoviraxi.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/98882176632.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0c253cf3---97501921143.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/2746454505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=biology+2nd+year+book+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_off0000c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 17748 bytes
SHA-256: 3399304f4af2571489b762acce678747203a1547bcea03fee9492603174da36e
font_02_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10928 bytes
SHA-256: c680c557ee28ec82e0f275774ee722f7202d4500f9a23211cd89781d45899ed9

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