Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6686d5b89146c9f…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c1122e1c4fb7fbe3ae81503cbaa9f04 SHA-1: b04a8b571a994466c3cb37f02d13293186318a1c SHA-256: b6686d5b89146c9fc8e4eaab95cfbe86c2d1945f42b8c8876a1aae975d08a6cb
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://aapltd.net/userfiles/file/vopeb.pdf In PDF document text
    • https://zivotzaokny.eu/res/file/zikofujar.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f079e418b6---budugomazoxepelotanenuku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee71401c22---vukufewizo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/surif.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cb9413c78---xafimedesojibu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd754d682---90491191902.pdfIn PDF document text
    • https://flyags.com/editorResources/file///numadusinikekonuzepofe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/32f5fd5d7816c2ac465edb3c52d3ae77/litusobivevit.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/8865041957.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bedotemizibowekefa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zufabux.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210618_8ADDBDE229CB8F10.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210704_2FC08A2470ED5EBE.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/29740171923.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c6d9f2c863ea5fdffac6ceb241ca33b8/torogilemexotakanosaxud.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7f307623d76177809bdda19ea37ff756/luloxana.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/3982406303.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/95e30925c98300f53601b2734272cc21/wijomobufovo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hda252kg1h5rdjlh0kaqfq8ivr/kelaguzup.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/26205992720.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608010adaafdc---23824327000.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fimepudabatovafopewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+fix+my+power+bank+not+chargingPDF 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_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17316 bytes
SHA-256: 434f1c3e905bf235c056d7af7371c6257c793cdd118032c2ee6c6e8e92bfca1e
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 1864 bytes
SHA-256: 2b2866497e81ca14d3efe55cada72f3a90b5962bfe38b96f2dbc41cbad85ce4b
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E41 11380 bytes
SHA-256: c70f0e8bec888f600dcb7dfdc69d9e3c6aed34198e769090d3615c44ca949556

Open this report in the interactive analyzer, or submit your own file for analysis.