Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c19df252aa72c5…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4526293feac19cacf7a2bf89a6ea3c5c SHA-1: 5e9ca41515901931d05c381c6de1f544cf3c2384 SHA-256: 67c19df252aa72c5e04899be75c785936601726eeb92279a18c1d09bef5b7eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=solution+of+bernoulli+differential+equation
    • https://bustotoronto.com/userfiles/file/97130821883.pdf
    • http://partnerplus30.ru/images/fornews/files/83205789969.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04be76f40---jipazirasatezovexoparej.pdf
    • http://artospace.com/pics/file/tabadivida.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ec4b3a271---26691098766.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9431f305f---fukeputebazumotir.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3958e42e---34654557920.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947741d5d39---68372434041.pdf
    • https://alshamiltrading.com/alshamilfiles/file/lumen.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/66259e75b7be8c5ea7aca4cca3c7c095/xefugaxenozavolomen.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/32121901201.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4fea1a66fc9538b92df8c490f195306c/17975761353.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/rogovasazunat.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609862e118eab---79625599197.pdf
    • https://acrgroup.nl/userfiles/file/41300560668.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/31fa4d421a1386f859aff8a330409390/32642968980.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c9ee1834837bfd79ded0d01894e1356c/tuwaviduru.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d795e45471---71749873558.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf720b2f7---bajexabowinu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29ac890ca---72824053917.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4fe69ed81c80f37f31c7f415764d5b5a/marovusuwa.pdf
    • http://www.darvidproperty.com/news/file/gewivil.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0dd24faa---mefukapa.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a833269ca8a---65010427221.pdf
    • 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_off0000e989.bin
d7f6f78a280e9e16979ab3951d293cb44a5754a3da01e5c54f689ecc58559d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 19424 bytes
font_01_sfnt_off00011d5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
font_02_sfnt_off00013575.bin
f294f34ca92c58c3aae5ce770ccc27342adbe741d7502c124e7b2b7525337416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10640 bytes

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