Malicious PDF — malware analysis report

Static analysis result for SHA-256 63eaf48f4368d3cd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55e727316b9b12a31766ca7155a691d9 SHA-1: bdeca1286ddb28f3d9d32c1f8aea04180cf0cd5c SHA-256: 63eaf48f4368d3cd2e710eb0b5f811195273140ef6ee622a181ccf86fd210dca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=communication+engineering+books+pdf+download PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d5ed32dc8382423316a01d41c548b4d5/88568992001.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/falukipapidu.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/61530325178.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/jezusavawojilevigajave.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d9da274b---vatatuxilanatek.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929872b620---3101665329.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sekabinipafado.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/99520662182.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/5963824115.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea13acd6d8---xuvanogi.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/dotavisesamebobodanono.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nc1fsf67c1fbj1fkffmovkm1p1/juzadulojojib.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529bc63ca---betojozexinigi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/69668647638.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gaduzaxoji.pdfIn PDF document text
    • http://abworder.com/uploads/files/73231086398.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/38848829893.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vlrgob46t78f8119s1h1n58ia6/madivajixibejupemeno.pdfIn PDF document text
    • http://kbchina.de/upload/tofidokozi.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/be84e5c28a19fcc7976d685a314af275/torugisilefi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c219597ba0---meremow.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf5ce96cd---vusinazedonapona.pdfIn PDF document text
    • 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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 11412 bytes
SHA-256: 2c97f9c87957c39b3c2cc1a4c5c4dcdfe886f77207c69eb9356b9e54708fc70e
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 18340 bytes
SHA-256: 81bd60563fce80c129d7b02e67cfaf6adda7b81656d49e1fae4a7f4b40a01353

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