Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac7fa7cf1bef7b0…

MALICIOUS

PDF

170.1 KB Created: 2021-06-28 03:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29c32b19e7c874816e004bb899d3ecd6 SHA-1: 7f92189dceb36d091b581938da96c1ef37d5d6a6 SHA-256: dac7fa7cf1bef7b011a4cc85914327a65d8d4b22f6a053b8095893853797dd73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the nature of the links strongly suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9212

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=sql+server+create+temp+table+if+not+exists
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a150bc02127---47057785190.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b434d0d1b---9175959147.pdf
    • http://sakem.org/userfiles/files/71466701652.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ffd1b36c---98962091388.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/mefajabawosesu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d9d3d0b0---togibakuwesipojifuzofo.pdf
    • https://twr1115.net/files/fckeditor/file/5627196864.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/96otmf299si50od8vjl0mhqj86/zekugumekixibobage.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mvhgoh6c7rqkd3j2q6i5vhpce4/67131875287.pdf
    • https://5uempat.com/contents//files/42313182153.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0b81bc1fed8d928bf4b82b69f4384db2/zumokusedokepolumitobuxox.pdf
    • http://files.ibiza-ferien.de/file/41224028847.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8771e5917fd40498e5d8e5d90db3fcc0/bibumu.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3ffb3061041cc062a0f1e4fc341f920a/wovat.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607247a5a06f5---vadikolob.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb7d8667aa---kuxosatu.pdf
    • http://waberry1969.com/clients/877040/File/28497766232.pdf
    • https://tylbm.com/Upload/ckeditor/files/pokugolelerasun.pdf
    • http://quincy.pl/ckfinder/userfiles/files/66401266440.pdf
    • http://vimbark.sk/editor_uploads/files/mabiv.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85604f38c1---98484355602.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0a402d0a---vikexenepadexinorobigitur.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/237544f32f1b3f53f1bcce32cc5d0d1e/10781809720.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/225931275ecc54b337da01b138060048/dodozotojixefexumojat.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c6574255---wifebugi.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fb5c33e9---vizoxaxijapetafonoku.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739c48da8f1---nakafokazikuxogokusu.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22E23 16792 bytes
font_01_sfnt_off00024635.bin
65f366552492845172cba939fd17a5397bd9120bcea8e0b180ebb8e3c714b8fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24635 18276 bytes
font_02_sfnt_off000276b6.bin
4845a2042a1526c8ee14fd27a6e9d02b61676368964cfd3357d43c7f41f86d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x276B6 2268 bytes
font_03_sfnt_off000280d5.bin
d88f7f2653361c4c9162090e37bf6f94be8efd4db63148d325ca356dd0e281d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x280D5 11172 bytes

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