Malicious PDF — malware analysis report

Static analysis result for SHA-256 77440102b5d8d390…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 02:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63072c18a6ffd2c55cc467524071b939 SHA-1: 2b7a860d2ac1b81de606015f3621d4a0ec8b74d8 SHA-256: 77440102b5d8d39032579018751a8b98b0b599d5831390c3b44f281954e18183
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://infinivideo.hu/sites/infinivideo/files/47072489456.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d87253e08b---34906262768.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/95046525787.pdfIn PDF document text
    • http://kes.org/upload/editor/files/2073000067.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tnh75c93g1gn6onbij773b8dff/50136622050.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/df692448473d4ebc73ecec8f51280e86/bulile.pdfIn PDF document text
    • http://edgecs.net/documents/nexemenekolubivunarerosep.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/54535914894.pdfIn PDF document text
    • http://foodchemsino.com/d/files/veselumipi.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gajogidu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/35079655783.pdfIn PDF document text
    • http://odumakus.com/uploads/files/saditox.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8ab61aea8f4f387416df0fd564738b86/mokemitusoresiwuxa.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210707_192928.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/48982688980.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c3a3874ac---soregafilopogu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873788885c---20657614231.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/82071276730.pdfIn PDF document text
    • http://webursitet.org/Files/file/wipikosip.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/vasoragivitazukiti.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/765f9307e71b72d690ad46f0c0bbce01/komijafojuviguzed.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/945dfbc94695648b4967f84189be07ca/72411977403.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/98ea135db8df00ae5feaef218f376312/nijaxarewusi.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210726_63CAA8FD0CA928E0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=divisible+by+3+6+and+9PDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10752 bytes
SHA-256: 3e8c90e3e9b3477c2199ba8b7cab6e575731f06dcc6c14ae9a0201a3060cfe4e
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 17848 bytes
SHA-256: b07b36f50ae7af94ac8685eac5ce1708557cedc0c2f7fb9938a370f6279767a8
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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