Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a081380d084855…

MALICIOUS

PDF

95.4 KB Created: 2021-06-22 19:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 828756f8a83beed092710ed9d50f977b SHA-1: 7f0dc95cb214d22bb36950ba6309101f27942847 SHA-256: 77a081380d08485517b0f44d48f14cb9458bb25c6ce0348bdb619c96adfa1332
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.3876

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=ganesh+108+names+pdf PDF link annotation
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/klkdig9ua0mtgnt1uk9opa5r76/96156656877.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608131e5365f0---9110656289.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24dbb9ac2---121212496.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6c29063a---tajowusitavobumu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/15187638768.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/id3fpruft56tl2brn3mvplqni6/gavosixogaxanowekem.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e6da3f9b99d30ee7aa6a61d75a1568fe/lemuritiwetolutitidusa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa4797693---zebolunigupejupoguweta.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/21725996793.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa68ac0af---86240629772.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b8dcdcbe95682c8c1bb20163b524b02f/53146305633.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba9b9fdeb1c81945a8551f2e591bc15e/19491291092.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/99125166413.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080faff7450f---bupepasaxikozazodosojejof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073543304053---toboxumaxibotodokexoxax.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d28bb7dbc---31293253311.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mtkdqdsddmih2uqfmv9oopenid/jaruvuwubixe.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zosokuxuxag.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014eb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EB3 16520 bytes
SHA-256: 59e42bb28da559e251b9341cbcc63b94f2744b529b402f8098afe8fc751ece20
font_00_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 5120 bytes
SHA-256: db664474a753c9916c50509e8108c2dc4cc8c8f46688754e5851bdeccb974e37
font_01_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 11012 bytes
SHA-256: f1fffbb73a13821f9fc4bfb0c8a8c71ecc5e689b9064938992bf1bdc182f5e96
font_03_sfnt_off000140b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c