Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc33ccc8f260e90e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 17:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02f43bab63d63f65ee32fbd1263af70a SHA-1: cd3edd78776ff05a132341c19a40e2abb043875b SHA-256: dc33ccc8f260e90e261ebafc9f785957b992bb1c437ed115f83c42499dc1ed9a
116 Risk Score

Malware Insights

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

The sample is a PDF that functions as a link farm, directing users to multiple disposable domains. These domains, in turn, host further PDF files, indicating a multi-stage phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's an image-based lure designed to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://youandisagenix.com/ckfinder/userfiles/files/98229409763.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/19420366452.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/37800227316.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/8822271526.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/jovane.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/40464307871.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/fujakesepo.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/kuritobom.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/70142722800.pdfIn PDF document text
    • https://best-label.com/upload/files/wavivakekagezovusesov.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/merevivexinogisino.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///titefu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/79952899162.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nuradatal.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/regolokosu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/49511691346.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43754122140.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jafasivuxuvasid.pdfIn PDF document text
    • http://safarang.com/basefile/files/25448419581.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/88767130346.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/80076731485.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vhifnv8tguu600t8akut1m0do1/36529036311.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f9h1if851rnuidnqg9s89ma7lu/jogeli.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rosevuxune.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916cbc44a5---79823628171.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nosaruzixov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=collective+nouns+list+for+class+4PDF 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_off0000b0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 13968 bytes
SHA-256: 95b2c180198cc26fe2fc89f3caf0e0169fb7c4b8b7727e3ad089800fa3ed41ae
font_02_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10604 bytes
SHA-256: 88dc8954ef5cb0d8282acc28e39dff7edecb0dfbbad228527faa4b46b3b41a59

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