Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b731cd521476d2a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 00:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8e0d5b737b3fc05a117c50147ed2ef5 SHA-1: 53f888c83adf9bbd92b967386bc995f892efcbb7 SHA-256: 7b731cd521476d2ac5c0c236b4b69b99066fee84d609f4ca075de77d7df05768
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stijsr.com/userfiles/file/radobezilufikexenaku.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/4818648949.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f6edf037bb14e51f975449fd238e1b33/jarivasevenolo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mt0v1174pn6qosuork4m7858t1/79948681049.pdfIn PDF document text
    • http://ipublicity.cz/data/file/vexejeka.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/94000640711.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/35621864097.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dl8tnu1859stjgn2j7ajrj79bf/35565144458.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8b3e603e---10096352777.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/27579063542.pdfIn PDF document text
    • http://toroisg.com/public/images/files/31011713595.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/xawesabejusojimanapoferup.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xapapalelekufovujodo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bcc893df87---mijelofaxaluxasodixiwade.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/tugizonodorunuju.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fuzejej.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/tuxagovijawuzawarepir.pdfIn PDF document text
    • http://asvpp.fr/pdf/debij.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/76413489949.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/37766677143.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c3420560e381043e2c4bd5a157553a9a/domironokixumunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75a1c88a34---38600066648.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5045a4c00a9a9697885da07e1fb4216f/29203249931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rhce+training+material+pdfPDF 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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 10824 bytes
SHA-256: f756ffc5b20cec6eb5e178299fbf1d8a688f9adaf6de4409e6f0468f6ec5cc17
font_01_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 19276 bytes
SHA-256: 154e4e5770102f50952bd2eac960f91ff644462eba9eee4f4be2466a88e3e642
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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