Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba30305368baa4e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 02:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bc1d841e8b94d2e1550eba03e9582ee SHA-1: 79467797458e81ee07306e3aed21384ed2f0806e SHA-256: 0ba30305368baa4ef891f449077a35eff878651eb4d7b24101fd0460fad3da84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress upload directories and other disposable hosting sites, suggesting a lure to download further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing campaign disguised as a file converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://poolpoint.be/uploads/file/77330598461.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e161918ad---vepisebejugazotib.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161293cf276bc1---1989637112.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359f3ef17a3---zetemiwodulunefizu.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/52679033319.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079615157e1d---21022101572.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ffaf04e---86304693683.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6017cb7eeb---37091671309.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tivubupivalikofupetexufam.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7610c1b33---fewabida.pdfIn PDF document text
    • http://nfc.soo.jp/file/26820557300.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wixowepiwes.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd0601b44---dutakubiwejomuvatedugoba.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4tb5ddr585rbpj42glrgb7buue/jujewapoxavafa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc58eefcf---jafojujodifagojem.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/q5op6retjkungjlu33vl9v56b0/lesagixenununitalotupa.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/18648374670.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521055443969586.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vijeximopitox.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e97b3e789---tiragaragamaxamax.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fawagigosokixuli.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49308ecdd---relomejarerebosebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adobe+pdf+to+powerpoint+converter+free+downloadPDF 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_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 10720 bytes
SHA-256: 7425eda9d249185874edac8ac91bed5fa170d97d61e12eddfe2a41c4dc57557f
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 17652 bytes
SHA-256: 4e691fb523e5eb66c1d6d73df6253c870ce4304381f7148e290f7cc4e63e0d7f