Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d99510d632f2a0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 05:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f1169da10ccead35844e7d0b5c17076 SHA-1: 2a5e40e34356dae1ab653fcd10cc3918942fcbb0 SHA-256: a7d99510d632f2a0aa24acfc6704b1ea8e4a42ae44ee5a70a167612eac5b15dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://dawahcity.com/userfiles/file/subedusujakugobuledis.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/96328141526.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/14089878083.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nowiguzonubasitotujabe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161094a18f3f05---80799686709.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3186a924---puvukizidi.pdfIn PDF document text
    • http://yjccnc.com/upload/files/64525893625.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b96e9e949---nizonape.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/58825302452.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/xagufabolafinizogomig.pdfIn PDF document text
    • https://strechybenesov.cz/content/kiruzodab.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/pisomilesuver.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ugkj6sk2rfsn9jil8eorb15lg6/gaberasanatotikisu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/sokelonejanuwana.pdfIn PDF document text
    • https://netpage.info/userfiles/file/70689299307.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8bb35f7cb---41659126934.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/konodivefupomofumulumote.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/20483537017.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/92129409063.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/71454643595.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dusapenopevitijozi.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/71546759129.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0132f194f9d6c809deb38791f37a7872/zurip.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e9f251e5---90279855065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shoddy+work+meaningPDF 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_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 10752 bytes
SHA-256: fc683101c01ef5cfcd578a65b2a1dc9ba97d576358ac73365a26fd36ddc17a8b
font_01_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 22868 bytes
SHA-256: 09165b51502caba82d27c6dbb125b3b194444af4e7df31e1f9255186ad9a79d3
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16424 bytes
SHA-256: 8cc01840ff77d96bd5d27fb28babdeec9caff47fb3abaacb8f8db2f423867736
font_03_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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