Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba6044ca29935e1…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 09:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cabba04e4c7de3edc60dbe51a25aa05 SHA-1: a249273657b24d55ee701d9491223716891aaa6d SHA-256: 0ba6044ca29935e19c04acefd3083a269ecf4570477fcc816fe482d3926e6a4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious files via these compromised hosts. ClamAV detection and ML classification further support the malicious nature of this document, likely serving as a lure to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984aa74dab9---dasadulenogemewidoregun.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f48ae743---91309693500.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/zekiminutapazaz.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wetitijilir.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/75231183222.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160772c41629b7---7880782456.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/toxaxafizejomexage.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9db1e6954e9c4e81fd274f205ba30558/zimikolorivuzoleka.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6469c99e4ac27dff748003bcd9615da6/mitalagolim.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab0e3e01d---45687827422.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab070c2e8---11207330499.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cu6na06trhtnuoo0fa2l6pooie/wesigakodafiku.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///65141157883.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a18926ecb81a685a41bd76d1177d9571/95106971214.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gukubafinibawanikitibofer.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607152e6e2ce6---27335449401.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/1845813861.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e31eb551769f08eb520498619886742e/xaxebaf.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/24307844687.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/joruxelopumasupewuradoji.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/50997955218.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d654eb6d4ab---85750706871.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/dasilitubixenaxixezabozij.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/54dec18044616a411b93c7aa80efccc6/wodugixiweziferuwebexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=retraction+letter+samplePDF 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_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 17108 bytes
SHA-256: 4ba4d02a286433c4c8a61a85cc9cc7b6e00796ef521d456d3537791051c3414a
font_01_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10580 bytes
SHA-256: b520bb21e39b04a4880c27cc6c4b7043ca8b436930577f26538f54a5bac98cd4

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