Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b4340d04e75f9…

MALICIOUS

PDF

92.9 KB Created: 2021-08-07 04:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3f4b38aada13890c2ee7b988f730116 SHA-1: c0a4459ffefe441c9008c709894d92c7f2cee4c6 SHA-256: 9a5b4340d04e75f9fbdb919360f4cb7229d4c45f069df42c78e576761a166a72
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites and other domains, designed to trick users into downloading further malicious content. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to an algorithmically generated URL, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8543

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://driver-jazda.pl/upload/file/27327874287.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedf531adf---sanakokutikixunexox.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rikavanunoxekisajidunoxu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/diguwimurozenon.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d045b45d5a---47358842475.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/97428873606.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/jogog.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/litabajewuxeda.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000e6b58f5b---musotumakis.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/26321768097.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/xiresefuzuvelurilu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/lopoleneguvavox.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/76326839607.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c567a98d99f---rulisaku.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c03c150ad---tegorazesilexawarojugi.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/firozarenorubojamamume.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/bifelapugomi.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/750dce1eb55b06440be2509f1ad86ad1/parez.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c66fe39414c---bejofiridore.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sivogakelononuwabofitoga.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/707cc06c923e5c693d002d445e857849/14243590731.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb0b4e0b3---tozejenepijidulutav.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/57148432977.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/55135748189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+lucky+blocks+mod+in+minecraft+education+editionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 18476 bytes
SHA-256: 9940f756961dcf054b302c173a786b1045503e0f738a78984861e8606708e062
font_01_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 3692 bytes
SHA-256: acb6286f9672d71e52df1f42ea692038c720477feb41743292ae5f85e9f5255a
font_02_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 11344 bytes
SHA-256: b34c1826aabcc5165531b4117f1e45f275274883b06a4e2296dd4733ced1cd21
font_03_sfnt_off00015cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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