Malicious PDF — malware analysis report

Static analysis result for SHA-256 792a1b3f28596025…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 04:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b6979a7203169e8a257472170d46ea SHA-1: 5c81a03eb5738b1724e38fde932f88e388625f2b SHA-256: 792a1b3f28596025266d506fd42eb6142020c22855d7fb52b20c6ab743d075c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant portion pointing to compromised WordPress upload directories, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://whkmradio.com/userfiles/file/55230740045.pdf
    • https://autotronics.vn/userfiles/file/43646819585.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5le9d4vakgsn47rfaume52nn2r/bavefaj.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qo69qis8h3767gq48blrro3rj7/tesijebalogav.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2a25e29c7f169da4e5447c08bae0dc15/menenubazotukuvu.pdf
    • http://humanitool.ru/userfiles/file/saruverenisetog.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/caeb202f83f4b6e5e5991fa5d1e5539c/41372303007.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/586e8gflc94hglqg1fvgaaglnq/watusadi.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7oprqv08djkq18frs6b66qbou/86232294967.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71bd5eb8825e7e46c4c793852777c87f/sulubogukatemeladexot.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccafbdef7d---kijezeba.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2229b0f1---zexujupobibofo.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087716c4004e---pefajifedexaxapu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425df39047---73812365961.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d7308a23---4347215630.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d5397e55---27015723681.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/55f673e44710c33cad46a90daedaacd8/tisajebi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/252e693dbc130a297c45532638045c1f/45828578725.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/94091477281.pdf
    • https://footballsod.com/images/ck-uploads/files/10113320324.pdf
    • http://studiotecnicomaglio.it/userfiles/files/58348756625.pdf
    • https://iamtimeshare.com/userfiles/file/lizibobuma.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086ab5a64bf7---95052597585.pdf
    • https://aterhesseg.com/up_image/file/49068732842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+does+my+cat+wail+at+night
    • 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_off0000f89d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
font_01_sfnt_off000110b4.bin
32b3cf1d104946875e0842dae8b421e7b6bec19525f4118f4a645a8f71f4eda1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10912 bytes
font_02_sfnt_off000129a2.bin
130b10c5cce19a25a2bcc8b3c9c1217e517715e07b0fe75c214957cd4b9c0c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 17216 bytes