Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68f7bc24f712ce9…

MALICIOUS

PDF

81.9 KB Created: 2021-08-25 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 964dac31f113c1c480ba39b35c32007a SHA-1: f67a4794d877325f40b008be36042c86780b6691 SHA-256: b68f7bc24f712ce99ed34b2d9bf7c16190fb1a0fd5489c004bb0fda2361dee9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These URLs likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a91cf1728321381255fc00e00e436d43/wunajikalutovuba.pdf In PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/45066669275.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/pewaji.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/kozijiniweduwisavu.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/xizibaromazixilewopebale.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/13525429954.pdfIn PDF document text
    • https://ovalpolycoats.com/media/49346487391.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/52f9a18e8fe96e03be9a0290cf8adc0a/lisesad.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b393a72fd---50702305472.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/64157ebfa6fd9b0b71adad1a26ff5221/beduladolabodiniwe.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fggmm0l1hv1ngeci6vlnamfuji/88535695808.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/xatogeroki.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/1197583866.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/40928040626.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/82924404175.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/barotonedovemu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7549cd5fa2---85073971500.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077b471b7047---26584034038.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/govajutenufevunot.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/mupatilis.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/eef5ca9b76a44d11f5edb30c09a0db1c/61788159317.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0976ea0a32df99411486db45298d9cdd/nonapibuguzopoke.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/20b3ffedf19494c790984d6885f27d59/10541805316.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/maluzonefitofufuzivoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=put+on+your+sunday+clothes+sheet+music+pdfPDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 17712 bytes
SHA-256: 8149ec522f4fb1332d8a1025ed40d3b8914965dc75fafa47abb9092c4e7048ec
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 11100 bytes
SHA-256: eeef8b8f318e17917a4ba9078511ac59aecf27c813af7a123873ea7ecb11cb0a

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