Malicious PDF — malware analysis report

Static analysis result for SHA-256 0481b3ed20f857c8…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 01:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a10046c2bc9783fa7e6f49554483093 SHA-1: d31f1cd7055aed8c366e610febbb55231d0e85fb SHA-256: 0481b3ed20f857c8872451e7a757934c7100f2abb55f4bf07f49045e91f70368
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be phishing or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://riph.pl/userfiles/file/gusesibakejube.pdf In PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vawonefi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/689dbeec121ef1898660f3bf921d4621/favewogu.pdfIn PDF document text
    • http://shosholoza.de/file/sujinazokexisobumez.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6887465d19108618bd271ded20f19915/94764220848.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/73mam4clq61il8repi4mth9ico/mutomosasusoluf.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/jigegazataxek.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vezomadipefudebe.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/16541516907.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/kazoduridu.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/guwizi.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/86457431663.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/93498498374.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/xanomevamabidoxezup.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/nexanidonananezaf.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/votuxoxejagiwogewor.pdfIn PDF document text
    • http://toroisg.com/public/images/files/duzesunav.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/86195409854.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/woxobulilafaji.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f788b50723793d4abd20bb20e975f806/sapewa.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/78tbgmjcopdv292104bga7jb76/97418295497.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/87151366142.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nazapokuvobanubux.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef275ede72---72255721846.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/59269142451.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae5e19479---kerozokipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=timex+nature+sounds+alarm+clock+radio+t309t+manualPDF 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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 11248 bytes
SHA-256: eb372638c9c993fc6a5afe84d3e287e1c0f1a96109d93268b254e01f142440ba
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 18300 bytes
SHA-256: 6a690240a023e7d5598a2633346803cedbd2ecb6897563fe1cbf3edc3c6b73be