Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc8b2b88102c007…

MALICIOUS

PDF

77.4 KB Created: 2021-07-03 01:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4818adb1cf1f4129b36e4790b6e663aa SHA-1: 19763bcaefe197c29fbd9f10dace0435bf23b884 SHA-256: bbc8b2b88102c007aaeff345681f0e41077bab0f730270b4dedaceb4bedbc3b4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4111cb0e2e258e72aa7c20c6d3ce08ed/ritenima.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea28463b983424bbc02be86d156040ed/5966254407.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf83d6b89---bozitiwutudusi.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/df75988d79367ba3f744815e1d3badc8/ranubi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082abb3875cc---vukukujaletukiludarix.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/jidimaluvoza.pdf
    • http://sb-78.ru/files/file/rozerawekuladuzapupewa.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3aea5a8702c3ec944a3651db86c830e/64032975829.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca7139c56---wesejo.pdf
    • http://daiichihr.com/uploads/news_file/67684949409.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/1539616150.pdf
    • http://www.puhito.hu/uploads/35759577814.pdf
    • http://okzawidow.pl/img/upload/files/niruw.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/glv0fc3fq747naa2tuaf3djmno/rejumi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8u5lfvemsivehvk147sgtsqkgd/mawewuzamiwol.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/915f076fc1782064643aa1e268724024/rirurivikopinexopir.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1ef1d1c1---sebigepisixu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8827b67d24a27a3aa39aad8bc7ee3440/47944948250.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0dd978b5---bukiponojajuzexeni.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7174d56ab---zeropoxuwajotofuwuxal.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872e1e5ffe7---79373220433.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609856edd2c98---nadufejibedarod.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5adfe19f139a14083b1a01dc85f41752/8933016965.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ed34348f---58668493447.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/34769ab16e9eb9e35247f768beb5b396/redis.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c77a181a---jokoxerovatatalanotinube.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=township+trainer+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://bit.ly/36UIMwwTownship
    • 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_off0000cb71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 16792 bytes
font_01_sfnt_off0000e383.bin
cf512db21c60974cc81cbd4267d09da9c4ba2b24a4ef2b9bcf3ef82ca75a1c56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 16812 bytes
font_02_sfnt_off00010e3f.bin
04a72354c079af8d7c104ee167c585544a89c160541df4c5d4e279ed65033e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10664 bytes