Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c28d97fc87cbe6…

MALICIOUS

PDF

87.4 KB Created: 2021-08-31 00:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efc4bd04e18f6924ddec9a8ed32605bf SHA-1: 32981146a9156e5c73c96bc2f5a2faddec5396b8 SHA-256: 76c28d97fc87cbe6491ee84891863dfda52f299de2dab91d52c012609b428433
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous distinct hosts and links within the document body supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ffd1e71---kusuvaserumubep.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/250c50e899956320b7624c19e0687257/20630032394.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/judolenibetomiwubusin.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2bfb8d96225b95354dc2f66fdf83af06/dirog.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/sijazatekob.pdfIn PDF document text
    • http://fittbike.hu/files/file/jevenedizaxibolirazeput.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31652464155.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74812662312.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dvt37fnuhbas1o1gv34e93kv6n/36896900539.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/junosenozupozijotuveriram.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e25e714f---45313759089.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9c33cb09---96285632991.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a8ee3f26---wobizagazululuvif.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d0cfad98fda94fd04d471daa3ea54709/82630966855.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/nunosajifewasokababuzak.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4ffe3362---19588019405.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/3719920498.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/mobamazi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63536e395---xadagemobuvebakom.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610452772b148---tibirogopipujijavikilu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/16737239747.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/wedaluregabonis.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/jenowawepumisuliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+app+cache+locationPDF 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_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10424 bytes
SHA-256: 6e279d6a3ebcedaffe6a5b15d9ef0660b2af13c481f626bee4c9dfdbb79f705d
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 17592 bytes
SHA-256: 06f113495459a2084f34194ab79c45d0cbfa41710b988210d2cf5380b394723e
font_02_sfnt_off00013732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1