Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f8e92d1ff6fa5a…

MALICIOUS

PDF

124.6 KB Created: 2021-06-28 15:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 24e88a7d5316060a7e9e8218d8bd108e SHA-1: 879a74197d7a0b516b1f6ac5dab0d29c904f92e0 SHA-256: 79f8e92d1ff6fa5a0b5b1462cc8609df69ac60cafc75856830dd55fc73c7d6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. Several of these links point to PDFs hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The file's structure as a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://hinodanang.com/uploads/image/files/tugegaxabelu.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kovixu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/datasawibibuwiripiso.pdfIn PDF document text
    • https://tsegypt.com/file/zisugo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/holvci8b51itqn3lu2uulcipbp/xobijev.pdfIn PDF document text
    • https://service-panev.com/userfiles/92893952692.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/pobefusutox.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e84f4eb8906724b58b50f68db9957b19/pajuduwabonovipuwufuw.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/42254911571.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/52852915713.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7121c62cf07d9757b903fa97dfaf0f01/24395604956.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/29297132240.pdfIn PDF document text
    • https://bauarch.bg/files/14696459831.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/126262ac1fb2d9c65bce4fb21b901120/semubuxofisifudila.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k7st9ai7ppp47me0h6qk9irs47/lezixoge.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/f50smp4nh19frta5bdmg77v3of/12840898444.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a8a50c8c528ea3707754ac50896dbe7e/84116428564.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/38285591698.pdfIn PDF document text
    • https://irantruck.ir/data/file/rufogozedepevi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e46e1e08b---menimasozeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=first+person+renderPDF 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_off0001854f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854F 18120 bytes
SHA-256: a3b2721955c328c2da6f1d2725b4442b4027e08dd701e67d791ebd622c94e000
font_01_sfnt_off0001b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD53 10156 bytes
SHA-256: 5e84683589a52bfbc5e0d7f37128a53d5656b47d388ab69d0835c288a6f5d5eb