Malicious PDF — malware analysis report

Static analysis result for SHA-256 58793e80b9a8ea00…

MALICIOUS

PDF

83.8 KB Created: 2021-07-06 17:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ceee38a7c475beb832feba3a7552fe6 SHA-1: df6a3d15bb3093b6877122255a2d6d2d997eb6ac SHA-256: 58793e80b9a8ea00661c34d9fcc3d6b2e226682e1cca57d4ef30e9eaa96574be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://emannsltd.com/userfiles/37518687683.pdf
    • https://seitonsolutions.com/ci/files/xalijul.pdf
    • http://shannonlakeestates.org/fck_images/file/39120024661.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949108b9a75---99267426787.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096134ad7b1a---56324576434.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3us8ppc2fh0npp521ujv9nh8bt/16146951017.pdf
    • http://mdsalon.ru/img/lib/file/92845173911.pdf
    • http://stlnsk.ru/uploads/file/70663812127.pdf
    • https://bocion.com/ckfinder/userfiles/files/67547251032.pdf
    • http://areaengineeringsrl.eu/userfiles/files/42960598821.pdf
    • http://traviet36.com/upload/files/20397654055.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816771f0766---sejalefod.pdf
    • http://cnkls.com/userfiles/file/1625306686.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc46f61dfb---83044009804.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c785504fe0b---biniwuwatife.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/947915872.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8fcccd52---fekumofemunale.pdf
    • http://ekolojikweb.net/upld/userfiles/file/48367242801.pdf
    • https://oklogistic.lv/upload/file/mawodinadulisuxetegesenil.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/43093539021.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d7c6612f---40893642438.pdf
    • http://okmarin.ru/userfiles/file/26799009662.pdf
    • http://cartonwrappingmachine.com/userfiles/file/65407227494.pdf
    • http://msslink.ru/userfiles/files/53419840826.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9673f43095c5637851b623e7b8e26abd/vidabukukokevifuxaviwuxo.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b23979b2ad6---naxowutepinigiwagokofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=engineering+complementary+electives
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e398.bin
d047226cd5d7e11ffd9a6b25f6fbd12cabe540299a525e3b725196c0ad0b1b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 10880 bytes
font_01_sfnt_off0000fcc5.bin
717266724df59079fe73c33af6f90b07f38c157dac45de5ccb674e990f56b9e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 17152 bytes
font_02_sfnt_off000129d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16792 bytes