Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b37a16855c0658…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab06f04283f84fe35353a7976de24448 SHA-1: d3d43c48f5585e0ec5fa78d22e706b757a4d116f SHA-256: f6b37a16855c06584ea630d89f76ddaace2abb3f333b9e0efaab61008495f3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms and contain further PDF files. The primary purpose appears to be to lure users into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://parzenica-bialka.pl/userfiles/files/29775868574.pdf In PDF document text
    • http://hoangle.vn/uploads/userfiles/file/rotevutebutowuredezi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/gefajerufanixuximaremeso.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/safopi.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/mizapeweginakiromotoxu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/zololelewuwejulegimigi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6cf593516f2d137667b4b48d9f1a696b/47799973176.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075daa5b163d---43897794074.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/1q49hji9cksammgc0enf685a0u/xapadoluzu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/88748615922.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/wagakapovedolem.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1310649b7f---98727579276.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bcade121420---19691753616.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2387e63453418609981e71a93f070b48/63513706324.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/50e096b2b6295e2106cedd2b54066d3b/58067154902.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4719b02acb---kojibefipagagubotifutapim.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991595e39a---46356948160.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f7e728c88---6107282828.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a74c90d63---vuwamesuzudukamap.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/zezojefanuwiwipadonufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=organic+reaction+mechanism+by+vk+ahluwalia+pdf+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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 11688 bytes
SHA-256: 47bbe9e534f0d555c07ed4ac6cb57176f3a7acb9b0bbcd4feb3853dcbf724478
font_01_sfnt_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 17032 bytes
SHA-256: 9337db1192353b5dd73a267802921b43ccbb03255793ff88f396e5dffcb20fce
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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