Malicious PDF — malware analysis report

Static analysis result for SHA-256 74126d8dce741183…

MALICIOUS

PDF

83.9 KB Created: 2021-07-07 00:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f56012feaa50ee37e854cdf6addf1191 SHA-1: 1bec9516607a9e88154d05526d6d8c1a46ae267d SHA-256: 74126d8dce741183bc0effa9fd1ac474c5d3ff63f0b105018cafa667a8f7376b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://comobrew.com/newsite/images/user_uploads/file/4173401036.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37884e3c1---xodutozegewi.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/65409467193.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/36295535298.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/40508693652.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gv2cp062jfujrl21924a1qiq57/48187435698.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/xilasutimunezapisoz.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/zuzariviludoxiwuvoru.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f8e7705---pevitusigu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/29285241466.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/12072431801.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/liwesekakadiz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9ba47d6c7---xolekusesijifig.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d18fa24245924bd993309d8c49ca6aa0/59999896713.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/dadikikoj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nt14agh0dlqletas2a0sl0nd97/wanotibibexire.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/lasinoneg.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e1816b14c79e432024330b2329f001df/piwerikexurug.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xigizifol.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c3c0f87bc71d32855508376089b6abea/woxevere.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/6300324254.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/29768214b55e52fd56ba8dcb2a232e0d/80889834380.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/9056915957.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/mifefufemutasoxopeg.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wolifofuminefekovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=supply+chain+management+isPDF 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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 10888 bytes
SHA-256: 4b60a060a6d1d97cf61b3cfafb7cd2d9adb80507c5afaaedd82e164d231c0a56
font_02_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 16180 bytes
SHA-256: b98b113e77fddec474a3bad928b8828f8af4dbb0780b37b5176f16931510fb76