Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd38b25c7b53d6ee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 21:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8c2a34177b388e227b171440774fc8c SHA-1: efa579c176ac2d3d7906adb9f79799b5f525b648 SHA-256: dd38b25c7b53d6ee9318737415a7b436809148e22c8f3f43be565fd487ab4fc5
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of a QR code lure further supports a phishing or malware distribution intent. No scripts were extracted, but the link farm structure is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ttccid.com/userfiles/file/49026747949.pdf In PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/21663343190.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea13586da---litefezejulezemamejinari.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613328a36552f---barerifirumedesa.pdfIn PDF document text
    • http://hkalc.com/userfiles/gisajopibozamarexejipomu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kufaxabudi.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/godinopepavowimivazugiri.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/fazar.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/86721827261.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f70150b3825cc11ae0063f5d9716ebdc/gonomawovesiz.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rugurakajizawipixane.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/sizuwutibozorawetokebipuz.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/34475637125.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee575dce2---57412262737.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/xojiforoxefepafufi.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/36066785918.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/54375376582.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/93396900891.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb21e6e8d---xupaj.pdfIn PDF document text
    • http://autovoda.ru/upload/files/49114482688.pdfIn PDF document text
    • https://jobtiara.com/files/files/8512874597.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/rifobitefevaligoxujeliki.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/61945435979.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/14799406601.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091104282491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=unicrest+qr+codePDF 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 17112 bytes
SHA-256: c722de953a516f3cd02a08dbf5433c697c61c1b678285d40ccbc44e40ce13b05
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10308 bytes
SHA-256: 043268236f6fb7ae6e18d106182a6cff12a2300ee5534871a2f83aac6a16c222

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