Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79df1fa2ae9ceb…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 12:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86b3667d63c013393f3d5673f4c267c8 SHA-1: f15827b3ff272822e95ee9ebabf52370031f5d62 SHA-256: da79df1fa2ae9ceb8530dbea9b706acb236a40e353879beaecec265b2e78cc9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to interact with the command line, a common tactic for executing further malicious code. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://porterbrothersltd.com/app/webroot/uploads/8257619915.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/faf814de793620f0823308b62d5cdd7b/zudonoluzun.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/87224350692.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/22212810497.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xirilegotenidunebanamumiv.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072f433b5fdb---24064605008.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be79eedecbe---xibijologijesagufomixu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609148aab9e69---suwexekorazimebujasutax.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00dfe9321---98967112359.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/613bba13073b59293ef570a25470867c/xunamugige.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc82d3eb9---midorojemedavubirajife.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/23451220934.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wexulatagofabibetega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85cd1ae0b---59534128694.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4555dc1834---80369782400.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/faketanigak.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/71291523338.pdfIn PDF document text
    • http://4bx.pl/public/file/bexuwuwedijop.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffaaf19272---60507276716.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/63ac4ec7f9b9a011c26eca9b4e5a6d49/13863799714.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7e36ea0e2953106dac6476f45c7df177/tugani.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8ir4n3et8s96pl81jojmdktg85/fulokazajibirawejel.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d74fa2ae1---sibixipupeburitibupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kung+fu+dunk+full+movie+123moviesPDF 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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 17452 bytes
SHA-256: d88e1a19be3b741a4ecc921b4fe4a21dcb6327e88301eb7e0e337eddafe328da
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10928 bytes
SHA-256: 7fe51ebfd262b57d4837e41f0082f87f01e36b4c8099b76abfae9be343bb70e3
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1