Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a4ddcc493e81e8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 17:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d248b5486b591394844764e502b20d63 SHA-1: 54b787018c30c2c71a573050191b48a96d5b366e SHA-256: 12a4ddcc493e81e8eca731546aca8e1e0abfa92a1aa1bfd1152dd9f8948ff800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver malware via a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 https://oklogistic.lv/upload/file/483426497.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/38f393f86202fa0b97db15832766cb79/13019726234.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/80453245249.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6v31fjvgnkihfba0p2vaaj60t1/59408722819.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/lodixoxa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5ed871991ecc1a57962a344f8e75ab87/lafebinezobimatejatu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/dewavotibapivenuvatabute.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/u273eng754olp49qf3nsb6s006/34493820450.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/89918179381.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f60810872851cf3398b231493ebd6457/83886998509.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/walugazajekakaradozodux.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/zexepeku.pdfIn PDF document text
    • https://adikketiga.com/contents//files/mubifiwikinizasomilodu.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/73844723773.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609840f9861e1---34670406742.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/2530348241.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a799babb48c---tuzitutad.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/48517426349.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be165b4fe92---ximiligulezejabakusilokaw.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vikas.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/lubupodos.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/rubapines.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fazixoxot.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/dogobiwejurugagat.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/32416982787.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/gunimoputovebole.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078dedadd1cf---tazuj.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/kagazupogozaweputo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jcb+130+excavator+manualPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 19008 bytes
SHA-256: 3984c4fb0ee310f8137921b428dab89271c0c44d7f982b5be8f35ca52310f9e8
font_01_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 10876 bytes
SHA-256: e374ff4dc75678c89834d5c0d8f9e1e11735b5f11a7bf138a6a1db606da80a91
font_02_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1