Malicious PDF — malware analysis report

Static analysis result for SHA-256 756ca655c324bc8f…

MALICIOUS

PDF

103.8 KB Created: 2021-07-31 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5f5b93c71a3a69bd74f6e5dbbdb062d0 SHA-1: f05b2a7cd3c3b44a52586137bd8be37f745dfa95 SHA-256: 756ca655c324bc8f71f3dde282a4f29d26e02e895e50ebe975dc3c7e5877ef18
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alimentosldm.com/userfiles/file/30416821549.pdf In PDF document text
    • https://golf-tout-terrain.com/publish/page/file/13484968327.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lsood0juptkpaqs5bhm0amq8jq/32149374111.pdfIn PDF document text
    • https://autoparkalbanese.it/file/muzetav.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/os3i0rio0cht8c53caadhegb51/zevigesenakurufisamor.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nfe5cr8m52bb1vv59opehqqgf8/79794719666.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7b7311f2---besajupuxubuzexojosape.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ed74240dbf1fb5817645230be5a17dbf/41436916962.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f735746831---dorenejozubotabo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469c2b9a76---64299933243.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/64446581754.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/691c4f8eb706ac235dac473fab6b3eff/xudixazutalo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b79be383---22071162071.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/fuvunuzuj.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/49442261190.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8f7102f2---favalo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/46477105975.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c881f071b1---gunoragudum.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/gaxege.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/sogekujesubigojoves.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/49955386948.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vekavopagulu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/lenijikib.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8fnjckjqgd3be2p8i0mnvicp6i/daxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+delete+apps+from+motorola+droid+razr+mPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 18544 bytes
SHA-256: 8a10a2accd2d3458e53e629679a20f6bde2d3c79d951a984a6ef01d9bd06818a
font_03_sfnt_off00017591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17591 10692 bytes
SHA-256: 0f63a0d51c3dc49c8494ee2c8b9eb2372de2b1c4724780837c88f59beabe85b2