Malicious PDF — malware analysis report

Static analysis result for SHA-256 a275c18fa8a4b3da…

MALICIOUS

PDF

73.7 KB Created: 2021-06-10 16:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f1d78f23e1b9a5916a1d4e1a4c21b338 SHA-1: 55494715dac29abe9f212bba68d324aaf6a70697 SHA-256: a275c18fa8a4b3da2907ba4d6374fdb03ea25fc0c17b0decee850a2eea1945d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phishing content. The embedded URLs likely serve as lures to download a second-stage payload, potentially related to the 'lwarb beta latest version' mentioned in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=lwarb+beta+latest+version PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160825ceeed7ec---fabumiwufodosa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/07s0t5ld7k5b9g07107njj5515/35851982005.pdfIn PDF document text
    • https://chp-travel.ir/data/file/7002670335.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/52583023166.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3877c79f---44160041052.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210604_044812.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f380a3b---23199900183.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/lg1pddg29l2cnh0h3u0uqaq36g/varadodavifajigafuwi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/sumovukakepate.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ce7a2d94---30359026382.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/ce3a88ede577e447cb8d17ab1530d339/sigumuku.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/gaxiganufuwo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/138930c96ed002b5cd998f889632d7c0/7763638318.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/11841b8f62e0ccdf19aa07618b9ceabe/zufon.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/47821494619.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/85092778945.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vcec5gtlrpl5ilr6f02b2oom26/zunisotevire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 4912 bytes
SHA-256: d168f8d63911b2cd3e27e926efe6fb42dcff58914da59e7c45449ed05b74b621
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10940 bytes
SHA-256: d75cb67675067ee7ee078dc2ef5a3650949bf213fcebe190f742b718497a8189