Malicious PDF — malware analysis report

Static analysis result for SHA-256 6194efafaf66d998…

MALICIOUS

PDF

91.6 KB Created: 2021-09-19 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79afdc8628bbcaa4a804225401c96f90 SHA-1: e16b04f87e19ddfcd17b845d394944df3f92c94f SHA-256: 6194efafaf66d998856702d65e6e9f95f87ad234cd2ace1ab6fb2456195315b8
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to lure users to potentially malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 5

  • 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://faurau.com/luodan/images/userfiles/file/dusunuresajagakule.pdf In PDF document text
    • http://studioingtassinari.eu/userfiles/files/bibuxoguxamulimali.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/43974539411.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/72743816343.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/dezimo.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/14528540980.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/67598123621.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/73371416804.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/801e80a881acc839b78e5458f039f392/35377836942.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e3a9c7e1---45621556736.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/mukimevexivagudeviwinuf.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f305530fc3---gekesejekevovovuxijozuso.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135adcc0bc04---39073624704.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/82214766748.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/27024306346.pdfIn PDF document text
    • https://okazionche.com/files/wepelefaxotavobejugisesu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kefagil.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8e36ded5---mefem.pdfIn PDF document text
    • https://revive.fashion/upload/files/zobitadafezituganidoka.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/nezukavazijifud.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144e7a9418fc---24133609120.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/30531358839.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/dukedawixajamazolelonexag.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/burerizedamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gi+joe+rise+of+cobra+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fb63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB63 17692 bytes
SHA-256: 47a93bc23aa12aa23ae72d8b4effe28a3dc42fc43dff537d722aab3ed00d6812
font_00_sfnt_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 19184 bytes
SHA-256: 1769fd78a78ae5e55e5b945e6d0e94c403e71802caf80f0a42d9600617677ce1
font_03_sfnt_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 10512 bytes
SHA-256: 5f16142c11ed6a0d6f2a83e7d5b66dd18b3b8e36a4304d88aa1f72ff9a2aee15

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