Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba309842d848e52c…

MALICIOUS

PDF

102.4 KB Created: 2021-08-15 05:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e8ec19e5cd2bd2a976daadbf4d8bd61c SHA-1: b23ed73d39c2e15cbd55b1d83159fae5499d1c5b SHA-256: ba309842d848e52cf5effde6c4f433ee9226c5d9e80bb98ac4e0f45c098272d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77421a40---11918301684.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079a336353ee---lisitajik.pdfIn PDF document text
    • https://hagepoorter.be/files/files/7233169560.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/70335117345.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510083237316719.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/pebob.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cr87dnlejtcegnomd8eu3to167/wigaxa.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/zokoruvusixabitebilaki.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/giloxaketuv.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/30888159867.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609346d49b9bf---fozuwotojewilole.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe8e98ff---41011279902.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/71543828569.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210615040100_msdxkm.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/59740080088.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/69089700449.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6a08531244684f44da606e394e9d41f7/sixasavumorimakim.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/naxesi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cadb3baac7bc89d29c982439205cf7ed/58471249718.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/wunitisifemijapevexuso.pdfIn PDF document text
    • https://yellowstonewildlife.com/bomuvusa.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/19712145243.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718fce4314---mosipizeridodisu.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/vuxokawutuja.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/rijolixipavafubone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=namal+by+nimra+ahmed+full+novel+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013c5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C5F 30936 bytes
SHA-256: 67abc129b782d25cb3e24d144e51dbf0f799532d6bb3291f982f0ac1fd4ceed8
font_00_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16916 bytes
SHA-256: d3b9afc245bbdd7a9cf6a6123539e81f92dc69222c162e11229cc169a1a21080
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10980 bytes
SHA-256: 16bd581e18c8ea2142228727b54557f49f8228c5e259d87cacf411377a4cee65
font_03_sfnt_off0001729a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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