Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f80898ff6544fa…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 23:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28397d4a16b3ea0278c5bf78f5477b6a SHA-1: 03d08cca7ff60b5f6ddfec1a55ebe851ac1a00ee SHA-256: c3f80898ff6544fab0265561389a3f13f4af6a7bcdffb2c6da694141f667d4ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure suggests it is designed to lure users into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4qfa7jig4tbdcnmtlksfq84uug/pesugexijigimudajex.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f5877fd47c8ceb3ed6f246b12a684543/34856400593.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210628171223.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23916c0d3---tuwewikajirarujinur.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/418d6d294e85a373ad24cc87d70bca79/dusilozugiti.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f63dacddf22e19c7179a3abdda2ac12d/91496271390.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab75135f814297671519ff5c84de70f5/62923470164.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/99454783890.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/81910097162.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jevasudusifevetotif.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/37094137741.pdfIn PDF document text
    • https://datawire.gr/files/files/5255426901.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1674b03dbf---20765838453.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/torukuwigosulenanofuzopeg.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a804840b75a---34660172018.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/4qr0s5bp6fhj612ksbhccje1ou/18609909335.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/342529530.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af1316ac4---18131975666.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f464707c0---fivobopuwunatusanadire.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/60332732997.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nekaseb.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/80908963168.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/zikadafanenelaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cannot+load+m3u8+you+do+not+have+permission+to+access+this+contentPDF 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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 17800 bytes
SHA-256: a5436db101cc9d04d3672a6641fd8ca55d33fe124b8ae3eb39e1020c5c2e281a
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 11472 bytes
SHA-256: 3e682f7784948968cc511be156bd98af90ff04c88185e8affe1b1f7f3b22dd15
font_02_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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