Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1aea0bf9bea8e8…

MALICIOUS

PDF

89.0 KB Created: 2021-08-08 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46ec08997462cc66c7cc3e8ecac85482 SHA-1: d1c9cf9b3a16e054df304cefeb41a7b4dc46ab88 SHA-256: 0e1aea0bf9bea8e877816a7f4ca2cd9081c00ea4865d9b1ac4933071304d84ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vv-alc.nl/uploads/files/mivinajexevavojo.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762311ae23b---979414282.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/31123974636.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be83d1d85d5---mopobegewomaxuno.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/11502028186.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/97087087161.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7327cf0b18---gofotufevepuzenegafukigi.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zikupukakikugika.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/21498212669.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/boreradomurodogikex.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d147fe362f7e5f9172f1277c7c2862ac/neseberasulape.pdfIn PDF document text
    • https://yorapp.it/file/23447450371.pdfIn PDF document text
    • https://arerp.kr/data/file///51704501254.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/38860178957.pdfIn PDF document text
    • http://strandedtattoo.net/file/tekigejajotugobuluxesotag.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb88d3e67c---gokajewexapefibemudav.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/volunumofasel.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7674f550d94f5e26b91290b9b66c5c77/73102057921.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/femujimezokenobefosevu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d74b24b9f---81945173.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f207dae48---4915873499.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f43a418d122---21024232452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bosch+tassimo+coffee+machine+cleaning+discPDF 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_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10876 bytes
SHA-256: aafbcdc84e098bfcbc1f9dd424c51f42b6edc0a7afed446e7cc00f6b2a02c273
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 17372 bytes
SHA-256: 5b95c377bf4b0762d3abc9a3f1fa9c5fddb8128524afffdb078a0fe8c9522e81
font_02_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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