Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb77297678c7965…

MALICIOUS

PDF

101.1 KB Created: 2021-07-19 22:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c3d6b44c589917242a80e12250f5506 SHA-1: 75e538b0051c981ce713843127de8c1617a5591f SHA-256: ffb77297678c7965ba00d72b9d8370a098cfc3210fd3729c239d2e2be11063ec
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab296535c80---nadudebefudotalozufexow.pdf
    • http://seoulmenu.com/uploads/files/filefapuzeleni.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d89fa6c68cd---68468134507.pdf
    • http://hyeminshop.com/DATA/files/4917880709.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad02ae6c---xanomabi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084062636b9e---remigevixogo.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0d50bdc4a1a7264a61b331401a069bf7/xumuvep.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef4496a64---3174375917.pdf
    • https://bor-diing.com/upload/files/72899156493.pdf
    • https://otoform.com/upload/ckfinder/files/budoro.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n5qnjc4udmqr8tfnkggpppde00/51846922563.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d0c6c877---92376659143.pdf
    • https://a2designbg.com/userfiles/file/5719665457.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b798dd8197a---tidarirabaj.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc5e1a318---nubawokame.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/lkrui8cbqbha0v846nqti76f5m/56029217061.pdf
    • http://volamtuyetthe.com/userfiles/file/gewikul.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077126fb0b6d---33657406185.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54c687b15---tetazowowezorew.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/94917575859.pdf
    • https://aspirans.com/files/file/wexalumo.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/50qv3ojp89u7veheq43ih5vbn3/33841635578.pdf
    • https://brianhigbielaw.com/UserFiles/file/tiwuvexufotigivumuselok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=biomagnification+hidden+dangers+in+food+webs+lab+answer+key
    • 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_off000125b2.bin
00ddad7017f2fa829db72b34f8561e3ed00386a2c5e289c6340b0010c206fb5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 17744 bytes
font_01_sfnt_off000153f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153F7 16792 bytes
font_02_sfnt_off00016c0e.bin
d15c0425f2c0b900d0bdd6dce00c520e81f8499a2742ee37274bb1091e2105b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0E 11408 bytes