Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c3c7e7695be64e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 20:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2bb4fa5b2c4644efb9dc8f0abf0e6aa SHA-1: 7f9356ec57a34d4b14cb45f807c692c8d95df75c SHA-256: 71c3c7e7695be64e6a1498cda2b737f171038e421dcc0047d97009bb122b66fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm on disposable hosting or compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amirafouad.com/uploaded_files/file/86805901734.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/fuwipogidewasatexened.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/datujosutelexuzodefufewo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed1386421---79927260057.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jisiwumovuradixakab.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/4375536847.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74983341734.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/58189626287.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc82911a2---vimani.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/15e572cca779eaffb38b503f81a0bd27/2538284548.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfcd4f9fc---kamedazozuguvasujuvise.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_A3790CA83A57F82B.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614963b8f1ef9---bagidonurefilerovopogokul.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/54491976713.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/xibevifizifegezud.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/34316861238.pdfIn PDF document text
    • https://majubesar.org/contents/files/72575737418.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902153258.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/20020652560.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/64205935790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=discrete+mathematics+with+applications+by+susanna+epp+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/68631292296.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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 11328 bytes
SHA-256: a1b15c91f33298825b46fed7122c1c79c40193a6cf976de8554a7cb9454404d7
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 17200 bytes
SHA-256: 442850d885ffe5caf6ce593830c63ab3e687b9041cee8ba25e2610b4a0edaf64
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1