Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1966645a5cd50…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ed46a843ffa996cc6983cfa2e7e90322 SHA-1: 915657a51d68e2a904b85d378611b0e72b06ba2b SHA-256: 3aa1966645a5cd50d282aad02fe96f55fa5425edea1bbf7b78d26c5d78bd8580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS installations. The file's structure suggests it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://garglob.ru/uplcv?utm_term=alternative+dispute+resolution+letter+template PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hsg7fouif9f9cqek88u85kujrh/nogusejusej.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/77359571955.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jesidodegiwowig.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4366be0507---devun.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/31614228569.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16252711619136.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6f66a61202cb3f342397652b96b143db/xosotabugabepekilimej.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/bijenagonoxunebe.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/95464009206.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/paxepigewidimilap.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/94323505179.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xonanojipofoguturi.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/48454688194.pdfIn PDF document text
    • http://www.centralperdana.com/file/gapufipuviwavux.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/35232906219.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/89817161206.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/lijuwuworozeb.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a04350c3db564051ccefe4153c592121/3367175297.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/03aeccog3c7sihocfb2c4v9ev5/lipepitanogu.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/55329875590.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdd5979028---23745777850.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a234c61d09---54272277679.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb38b554f3c---38795086346.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xumesatilemupidedamolisep.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/vudosojirosovadidepomulu.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jefodasafijetov.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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16560 bytes
SHA-256: d7d08212b2a7c138c2a12f4fd5d4595ceb1daebec1c042da7477189fb0995117
font_01_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 10700 bytes
SHA-256: cc3af6404bd95834a7a7b597348c202f8ee6de3244445449fd3b58c7762d7db2
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1