Malicious PDF — malware analysis report

Static analysis result for SHA-256 087692f440b053d9…

MALICIOUS

PDF

104.1 KB Created: 2021-07-30 15:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab5db0dffd2010c52f152d73c7d72f35 SHA-1: 52bcce043ef86b0707f352f596f3556829e6e001 SHA-256: 087692f440b053d9d4c129d85b9872ba7b7152c215ace5e36e0baff9758b810a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zafijesejegesavugokawew.pdf In PDF document text
    • https://ctsgroups.asia/images/file/47442763458.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/78767285243.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/somigarumovezupalojetinov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb10308b54---37322388877.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f587edc04e9f17461705bfec3723e403/70876986675.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/89174401985.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/losalezitasax.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3616ed98---61292389594.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f208882618---71992024802.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528180302.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/545757908.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nosalulamive.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/59453269252.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/nizekotuzerabet.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/93656991426.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160755b4698969---92745794076.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/zuwali.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/38764234680.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/telajokomiwexakor.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892793cfeb9---9303600057.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3c942b83---67748250780.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nugupudoditev.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/wetelupufenaporumekuje.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kujomakilumodikab.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ed0564e6---22567360606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+does+hemi+sync+workPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_01_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 10612 bytes
SHA-256: bbd7a2544a24cd93479a4a49cde5d80de8b0d7bb6fe47241e6c2146ad5b1c032
font_02_sfnt_off00014b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16341 18044 bytes
SHA-256: 48c78cb6519c817195e7a871db21effd9374d941f1124715e68f1a15cc2823ba

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