Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055e5585dafdf96…

MALICIOUS

PDF

154.7 KB Created: 2021-07-28 00:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aae7fc7a6dbf4150a64325f942006068 SHA-1: e155ad06f1c5fd83f9ddea063616c56754e82903 SHA-256: 9055e5585dafdf96a3839f5bb17838e62af0a1d167674f3762a1c582ee90eb0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of link farms and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ir9l9sbua5bink34gutdpq2i23/nusadokevefupe.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad98cb8309---lububez.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dusuzujerare.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b40abe4a955---xorunonexujibekamokexegav.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/45259033889.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/pezovenogunozajorokipuzum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • https://bonacorsi.it/file/naxoxotojevagenipadibi.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/34336657495.pdfIn PDF document text
    • http://www.moyekolodin.com/files/95822833227.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/64931078457.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfj94vbo5hkrenn1gfflee826a/zanad.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f2a9335b85d1706724a48712f63569cb/70735636423.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/35490411602.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/71051474411.pdfIn PDF document text
    • http://newo.ru/files/files/76891700977.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/buzapovividebit.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/bunokarikar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ten+commandments+list+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E2 18228 bytes
SHA-256: b46c5cf57904eb2daa968e7fb27eb33ece19e5467d9ceef155be0088f4b0014c
font_01_sfnt_off0001f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D0A 22136 bytes
SHA-256: b4df7f796a59ac3b46eef84497805cdba0a71bb6fec15e5271c3562404d16b26
font_03_sfnt_off000243cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243CC 10644 bytes
SHA-256: bf568cd971ee8f91f884163219ebc2301a8af04e221e65c8490c3619b093199d