Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c750996f4018d9…

MALICIOUS

PDF

76.6 KB Created: 2021-07-01 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 166854f69e93d58a60445907a2865f04 SHA-1: 8a282bb746a133870a7514336e041bd62a33a2e2 SHA-256: 43c750996f4018d9ab1f06c7d7b6ede8fdec9e981dd47906441184dca4e04881
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, likely intended to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wildpflanzen-planung.de/file/kutitosomuliki.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c20ed7a63de2fcc4fc5706103354dcba/21499153709.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721faae5032---86468147065.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6ad9c04c---38560951108.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607783aa08d03---dezedakunivemaxiz.pdf
    • https://travelone.ae/userfiles/files/fotovuzerejezimupufuvewox.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u6qqve3ufirqq8gqhk20gq9l4/95001256174.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e7a88177e096ad8341146ac55ea06dd4/paxeseb.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hsjf7c1dlptrreiu610p86gomo/38383593383.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/819b7730b3696a94df39e57ded92e04e/rakipazojirokesazadazox.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/43fefbd43998ae68307df51460d306bd/zejim.pdf
    • http://analogsys.com/uploaded/file/191909751609459107c853.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/zaxizivojis.pdf
    • http://aftckwt.com/uploads/file/nudipopen.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ah6bmtfquks253l82n9u105lo2/60850755825.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k7gr6utp8o4a0decpmka7b0uj7/75863643061.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/17f7021ec0b1b745c806bac83e8c7ee1/foboxolegu.pdf
    • https://circolodelpistone.ch/userfiles/file/48474553.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kukkhhob3kq3q6jnfh1nhnrjre/fifijopozoxavoxevipuguxok.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r2kslvjkg0vjh4jnr7f41pruv6/52058911294.pdf
    • http://asiadomainstore.com/userfiles/file/84647402237.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075132ace6d6---85735285808.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d0dc07fa---walimaguruxuloz.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a319b5c1caf---bipadusulevamuxejob.pdf
    • http://banphimchuot.com/userfiles/file/5242245745.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc77ebd4---12546408982.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=32+in+exponential+form
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e5.bin
d893ed93d67ca68ea6a5ad637e378212cf00770b2dcfd30b46cfb2c99a5a419b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 17516 bytes
font_01_sfnt_off0000f4d6.bin
3091a236133d070fd00464fb979117ac56acd1b0f37350622fafbae14461a2a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10648 bytes
font_02_sfnt_off00010d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 16792 bytes