Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e45cce8daab0a2…

MALICIOUS

PDF

89.6 KB Created: 2021-10-04 23:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d9e06e7380cf263068df8bc7872d464 SHA-1: 48a3f12c58bb42b3f18d598724e5969f6ed14103 SHA-256: 43e45cce8daab0a28d788b685494c451621b23b61c3fef2e49cb938de3284d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many pointing to compromised websites or disposable domains, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for link distribution, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=time+constant+of+rc+circuit+calculator PDF link annotation
    • http://biswasi.com/userfiles/files/85486346488.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tukisurimanaj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f819cbd889---59005442125.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mlhkgbhhq8bcin05f08dtb7vnu/53864125725.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/41691327601.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210929112145.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2581181046.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/nikigeliz.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kotekozuzevipusuvefipaka.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/vinipudobagip.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jobabalururak.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b2d26ff89---gazikutuzepanutafuxa.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/34461360464.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pazugagujafisogodo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/55041910435.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/givakowof.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/10310795358.pdfIn PDF document text
    • http://sial.pl/galeria/file/bejusizuxiwapexoluxonome.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/jevizekikunatasizakif.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/lixikaferedikinowona.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/38023592274.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a3fsjvc7p6s2uheh7ecr8l93n7/tofegerovozibemumijov.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/fazexen.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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10560 bytes
SHA-256: 32c90298d5f3dbeb6a1ccf5d245154e8fc87793bd6df149bd50d638a41fe0a15
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 19160 bytes
SHA-256: a8b0ba248323074b6dcb41b977cef425ee8fca0304fb517de79caab51852b2d2

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