Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57da090fbcaab64…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 13:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc152bd978a88b5d8fce824ce89b0a7f SHA-1: b83a82266fd645ade186e36ce6b8435ce75f3f5e SHA-256: e57da090fbcaab64be3a158199f1d8623260fac9a859114548a6d23bd52ea394
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b920690d1---mivagimevaxorisusupulibe.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ee01a4f4---92441801558.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/gotamimimipukebudo.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/89970926199.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/88698000375.pdfIn PDF document text
    • https://socardan.com/userfiles/files/nufiwafibawalanifazaduj.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/99845079907.pdfIn PDF document text
    • http://aquatherm-graz.at/files/litanamutiz.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/45485685377.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/95778754357.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/8871892538.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/45768836514.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/jizakobexaxanuzizubobuw.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/remugare.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vetofofugabojopif.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/damekulenibu.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/jemajonirebala.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/meresuvirexope.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/99323683101.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/nesuxajugepufizefaxevupob.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/53443708160.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pilomawesexuxoxep.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347f4e501ce---76487385154.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/36504983587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=apa+book+reference+7th+editionPDF link annotation
    • 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_off0000bae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE7 10768 bytes
SHA-256: 6a6855869f62fd458f575400e1f73ab64009ba5bf443d6c7dc2b6768a60113fa
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 17364 bytes
SHA-256: 11a1f4018352e0c06a18018bf940d864791b803ea898425d674a6c4dab951b9c
font_02_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1