Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2426d28cbc5242…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 05:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be389071bce237e95e56f621dbe9b7df SHA-1: 58bd809f71f9c7b0e4e3f830aecef6373e4723e7 SHA-256: 7f2426d28cbc5242908ba8ad4cc9ba373f3e129dd26472c19f2ad23f57643de1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/31ae64578b5173060b82867ab5d44873/17226086222.pdf In PDF document text
    • http://luluscafeonline.com/uploads/files/bepipafewiper.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/xonumukogok.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/culghuf4lhk10mmlvcm34fu6q0/1680684620.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d0a4a692f994bac2af826f196b5407d1/96772484944.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260a69500b7---82829444587.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/59118050916.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3ad1jtb3dtk8h1htm5olabd4lm/63578846230.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82109304393.pdfIn PDF document text
    • http://robbes.nl/media/files/lowegesemokivod.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/33849819348.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/54047519962.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/35300059616.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/datulagituredaguxe.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/nunopoje.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a9fjkmp1jle7t65ct3f0u8kls8/51685533323.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b74e565ceb670e660be31240a29c8628/7835629042.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/56901573994.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/sifekomufitovitobakela.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/39083843777.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e6067bf3717---66590103125.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28246e2b4a---94960437746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chicken+and+stuffing+with+cream+of+chicken+soupPDF 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 19124 bytes
SHA-256: 48d590ee11e5a09d31711983d11c7b61aef8e4d931e1c6e491ffcbb53e5e40ac
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 11328 bytes
SHA-256: c71a097c457e93d5c491ed6728b1a3887befe6ffd53ed2c2b3b84da84c35141f
font_02_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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