Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b91fa0a23508cc0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 16:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c2618c4b086c2064d206ed852186338 SHA-1: 6abdff913918de042e0f3d2793f03d58946e6d2c SHA-256: 9b91fa0a23508cc0f8857c438afcd6644749cb9237ff1510a4bd9cb3f47284cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many links pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=highest+common+factor+of+64+and+80 PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3of1h6rmhg7d3nu1ua4jrkhash/49884481418.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xelugoxal.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/texitoduf.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210716095914.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160847fe829752---nixatositefodap.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/dorekasevowazopezevufuf.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/ligaxubizeb.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/tozazibovevuzopa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a929997f30---vawitekisixufufopupab.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/beborajazaloxuronuku.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/zirizema.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16284219951040031366.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/tuwevupivuzaxuz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b303fba08b5---28747785736.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/47333879286.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e56dafd40544b83387db718b8829b1f5/vivafimuluwowit.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/juvvguj5l5b30c2u3f1bbnquek/zenasujotimejanolalapi.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/61560145809.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/22127385936.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4a60ea47---satibopi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gcs5n362fib8366fmc50ekkab/20645935351.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/93808757646.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/radosafoxoruludiwivu.pdfIn PDF document text
    • 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 20348 bytes
SHA-256: 4499baf5717b1000ac51778a2548a37eb4979054ebfec5c68d9e7ec0ec03642a
font_02_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 11444 bytes
SHA-256: ac3a027a5194b9cf1dcf342547b2e6ed20ee9161b491c08ce733567eef8835a5

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