Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a5cce2035b869b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 02:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bc8c95ae536dd261026ef2538aeb3ba SHA-1: d0f6adfa83e269eea15db4e79a559d4e3d76ca67 SHA-256: 53a5cce2035b869b1ee76d5f3368a8afcb841ae3cf3b498163fdba70345f32bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://schokobrunnen.com/idata/bilupevewapuvefifozesew.pdf In PDF document text
    • http://hkalc.com/userfiles/71762289073.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/2496922882.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/31077500173.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/66497182463.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/56742516563.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ce7931b3f043d75ca182ea43053ca4ab/58997797254.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7255e925d047cdee45c0c01e8202379d/80445357838.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3a3e4f335347cbb8f5037014adcc6f6f/99846177246.pdfIn PDF document text
    • https://verner.lt/images/files/fokawipobutu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5e8c6244c---55634650432.pdfIn PDF document text
    • http://parfumland.sk/upl/29608375738.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2e4831103---xemumizek.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/redamanedojow.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/fuwomutopaw.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/67341ba8ae37501111e03d542a3c87ed/gonadupalisuvakakelapub.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bukab.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/kibobiwul.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/35625123041.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3f439b31945b4f7e6bb285dd47ec11a4/fewisuropuwusoladutizino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=word+by+word+picture+dictionary+pdf+downloadPDF 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_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 10876 bytes
SHA-256: dc14715430541a89a2f109a9c4885e38a8a27ca59608a65550e56436741a1e1c
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17452 bytes
SHA-256: 11400172dd7d1222b7532268372ed234c413c1313412478cabf2e53935a9e4ad
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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