Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70abc87bc0ef66f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-29 11:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2f8a6f21e802da7ca8c58567864b236 SHA-1: 373d948b0e0f6dc5a48f43e93e95726b0fd9ba8d SHA-256: c70abc87bc0ef66fce061b88396b413a551d48eda59eef4248873400c2fb20b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=fluid+mechanics+7th+edition+solution+manual+pdf PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/vasoletewoned.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nanitorozadevotuzawaxoxij.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/xaxorotivasubixuw.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/nidagejiwuxakonotobe.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/mawefibijozo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467da983a96---nevavavizemewikewiluf.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/5177689361.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_1DDE2A617D8529A8.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51214454790.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/22466918738.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/libewameri.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/kudufoxefoja.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/58523409385.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/5421900160.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/52518429514.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/12528969347.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/62755507271.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/zixedazoniwibotej.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8e6172c60c7678c21c9632d261ead39b/xepapidumoke.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/79663766270.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/64f4e06f2558f659f1d666e6e60556ec/sozufireni.pdfIn PDF document text
    • https://unaizahic.com/Files/files/40438881917.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/tupofenajokoriveki.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/mumilinelej.pdfIn PDF document text
    • 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_off0000bbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 19980 bytes
SHA-256: 5d112ac9c64488fe7911545d6f64633508cf4480e8b2b9a5660713b5fd66ed13
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10912 bytes
SHA-256: 6f2460a4db692c0c566b0418677b133e789d5da830cc1f0da3d5dcb2b1240f90