Malicious PDF — malware analysis report

Static analysis result for SHA-256 191d800cf177ec4b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 00:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3be6020ec05176944156d1fe020d28a0 SHA-1: c5fd4e0aa016ce65c93e55f44c9dcc4896ad1700 SHA-256: 191d800cf177ec4b3ec7f405627e2fd007b72b81b85a3cc562a5605a8fc807c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=instagram+or+instagram+lite+which+is+better PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba47aab7e6---36992911705.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109032304314177.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/posovufuroloromefotokil.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8e1fbc635ae0adba392a550445f24cfa/44176151610.pdfIn PDF document text
    • https://wrd13.com/force/file/39346353655.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/jitexu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/zudogagufuwegelivozimiw.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xoxobowijurabe.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/puwiwuborude.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/26501614672.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/77043347144.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/99782fb5b48ee6d852d6cd237eb52eea/53163992099.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/moxoled.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/89204240714.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/wixagevowugeloxenilu.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/84149773332.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/36237910238.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xupozuregabopi.pdfIn PDF document text
    • http://topflexsports.com/uploads/89297839810.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/52009646522.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/27946448292.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/samuxamuvuxatanu.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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 16816 bytes
SHA-256: db80663cea71bb371f92d26a81e249d5a5499dab0b81ffc94b520b8d3be6e458
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 10856 bytes
SHA-256: 8705aa568641d064618c75f5e7bfb79127a7672a9e4831f0bbae64edf3aa23e9

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