Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f3fc4839053e63…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 15:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44b09167f1c0985a14285158d419d636 SHA-1: 22f1ecd3cd422ef76b9daff0d07c5b635b751014 SHA-256: 48f3fc4839053e63e49f1858337d0892abfb4d4bb34526d9dcb68888c5e5df24
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ya-ke.cn/admin/upload/66559651488.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cfviee80jlfouvb8pfeek93cv2/buwinadij.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/26666289569.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vefuroviziju.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/927b30ee30c8fb90421e3b7e7fb76153/8488777673.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/kinubopepusixezido.pdfIn PDF document text
    • http://fruitvita.com/files/files/guvagative.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/de5r6a3ek6k88j9ove4ihn19tc/71118402856.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6d5b1c68---95442879371.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e0f1f0c47e5c5a3aa2500b9d46ff3756/palazamuboluluferasowiba.pdfIn PDF document text
    • https://bauarch.bg/files/kexoxexugubagaligazoje.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1e5cf4ebfaea4549e329a1298925b9f/4704633261.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/86598204723.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/ligosixixorevuvizu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ipfphdvo8u6q8p5n4pij4bmsi/24798356088.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/56174040799.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/xizogi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111a26cc0---26928433501.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/zulamuwa.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd5620e62---pilatemomuretomamelu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30728bf52---13068579194.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4577406035.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/47ba55530b969a63370b007b2d64d957/durojixugu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c80a46dd4235c78c1c4e6963f373bc26/putudewarimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+puppies+eat+hot+dogsPDF 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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 16840 bytes
SHA-256: da1a9e2fb92e55862bb144bc13e8863091ec0a4f8b2a8a5ad3825c6e809bce74
font_01_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 10656 bytes
SHA-256: 2d0dc2f332267ded0340bad54ccabdea39690eb64d1c28d847c74f580ee57612