Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd9d2ac04af7f07…

MALICIOUS

PDF

71.3 KB Created: 2021-06-28 04:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9728132116d0b7079dde2c9146730665 SHA-1: 37fd7de3d463e5c4f06659462cd38c88c6ccca02 SHA-256: 5cd9d2ac04af7f07b8d67e747416dbdaeeaaf262e6a58cf73b8d6d7fd91fda67
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to various compromised WordPress sites hosting other malicious PDF files. This pattern suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607beeaf42794---boxuzexixerixoni.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210504013306424.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/82364386569.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nhd28jrqpp9l8og6l0r3bi3pr0/nekutafisaniwitigubufarow.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/844181a96f45ff117b32e2f032b6caa8/xupugofuwiwabigedimulito.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fc058a69f0eeb6ab684db5292582412/togiruselax.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/62877573679.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/gamabi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r1t0utff5qmhu0v33ej65stm44/gewojisezatesa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1534c50e---bujonoki.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1j88m6u89iua5sjjh2690boev5/luzikesup.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8847d98a0---disidizez.pdfPDF link annotation
    • http://timnhanhonline.net/upload/files/10193866769.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/61019317300.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/gosugi.pdfIn PDF document text
    • https://tckontrola.hr/files/4500480937.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8c7ca989---dedukekepapu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4ba0078e50d1cc45dbb603113bf5d142/59698456512.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078975d23482---16048965708.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/roloxorebipemukija.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ad7e67d091ae893651eea973835846a1/giremunetobom.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/538700ea5ea9540ad497afe592f4205a/72509440742.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dc0b263da2d5d8d7208b8e8c20eff923/64889762245.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba78491d9---fekoxudomogilasesinunafum.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/zemasipanesasediwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=from+euro+to+qarPDF 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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 15880 bytes
SHA-256: 971cb3513ab552d693c9724d5efc86068c2c68e9c7c0090b2835f4ac8ba987c1
font_02_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10080 bytes
SHA-256: 8487031de04d8042e01b2b11ab85820a344e62fcac36742494432eeebeaf9fb3

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