Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcd7956640fbf77…

MALICIOUS

PDF

91.9 KB Created: 2021-09-15 17:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df91da02e8b82835d640e30dd9354600 SHA-1: 029013c938cc9a41e190dbf1afc0fd80f2f3c382 SHA-256: 1fcd7956640fbf77a1f0790d6891f9748fd8dbada06e37f95c8f13ed183b334a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 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://wdnederland.nl/file/53869572253.pdf In PDF document text
    • http://aldobini.it/userfiles/files/89984827959.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/23519386332.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/77066543335.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352601613fa---83363331679.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/duduwotosusajaf.pdfIn PDF document text
    • http://svx.su/ffile/file/91803729604.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/kapirazexomuti.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/76736075334.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mukigivofuxab.pdfIn PDF document text
    • http://lejuriste.ru/files/file/49228135855.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913090708.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/69142770199.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/3100505901.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ae6d401b---figizegubajik.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a2c5925f---33258565264.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/18184180773.pdfIn PDF document text
    • http://airsoft1.ro/files/file/givebukezovusubena.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/jukaxarawuwegigunilet.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9ige2iv5co6c84nfhk2bsb21k6/56324664629.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/73426231165.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/b52a1eackuhoc9n4npe2pc3e15/ruxujizukipakexolafarobi.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/78514623520.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/59281366495.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/085e26b9ae4153d4531e32fae234aecc/81831612521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kuttyweb+movies+2021+tamil+movies+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_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 19228 bytes
SHA-256: f290733dd9fe2075b992e77c010def9101f8b64c69c246bf4c6565144a740ce2
font_01_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 11100 bytes
SHA-256: fde1bf92c774a6c9a2bd2672d3f54b9dbee30593cf10af2860eb1b519a68fb72
font_02_sfnt_off00014980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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