Malicious PDF — malware analysis report

Static analysis result for SHA-256 544c05dc1e2e0bce…

MALICIOUS

PDF

92.8 KB Created: 2021-07-21 14:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef6c41e5d21a5d301f8e7710faa0dd48 SHA-1: d0e84c401dafcf626a3f6d3db4b49cbf58a1a023 SHA-256: 544c05dc1e2e0bce2022d0a8ca1d59e65d089d8bd963796ec5463a990e69df2f
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external files hosted on compromised websites, suggesting it is a lure to download a malicious payload. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request, further supporting a phishing or trojan delivery scheme. ClamAV detection confirms the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af893cd38c---35379862506.pdf In PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/876900117acbd77b6722d3955a1b1882/32550754397.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b0d7c3f948b2ecca7f3b4660a031a64b/givaxar.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rufitubupexaxaruzemojem.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/59914836495.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/77db46dae54213133b8610cf40362925/95827925911.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/33775687376.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fb2ef4229d9121bf486e7266013d3c6b/7305587419.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/23794825672.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4c95e458---32974956265.pdfPDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e814e455---9491094090.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f10861e1f---vipaduxorajog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863715be8---fobajasojadasiveguwowifu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/dujifuwuvode.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e544c99ab---61764600419.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/62627196833.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091239ad7eaf---golosoxibuzilowasebesa.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tununaseludon.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/49284881215.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085727aab7e7---mebibi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suv0gg36f4lipau6vv3krgs27b/kevidade.pdfIn PDF document text
    • https://seerupit.dk/assens/file/nifebuwevaxoj.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57073df810---23486371791.pdfIn PDF document text
    • http://blatt-gruen.ch/files/vubepirimenafak.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1bf6b3d1d1363f40996e9349d987ffee/verat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=saw+7+full+movie+free+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_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16748 bytes
SHA-256: 942285cd30906ecb93017cafe5b8b2b9ade30df39fc295d3f4eb47c4391fbebf
font_02_sfnt_off00014c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0A 10624 bytes
SHA-256: 7101292b2e8efcc9a53397560ed3bce25a1b1bb906cbfa0e820ee620acd55880

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