Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b246246be7a533…

MALICIOUS

PDF

83.8 KB Created: 2021-07-19 05:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61bd2c23f0fe195e83a61bee7ef5565f SHA-1: b18e1ae90cbbe355695c2472da575223964ac566 SHA-256: 55b246246be7a533a0fa9bc2a2f23f641b82d175598128dffde2fe3afdb497fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a41062431---32746274040.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/16704650507.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hsnkq8mo9u92nphqig9r6bpapl/zugezejokexo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3ad2dee8---37420285654.pdfIn PDF document text
    • http://cichanski.com/Upload/file/52735820203.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t108ierngm4ejalbtq4r5481f1/22220266572.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/47385119865.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715863f9ab---33412816027.pdfIn PDF document text
    • http://erex.hu/upload/file/90647876804.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/47179045461.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/bf6d3ab6161a0caeaadd35153a1545e3/katoli.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/37149108260.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985dd2af0e3---21226490295.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fc91585c---23403445283.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/fakisizopisawebipanumu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf81a12e8---tavis.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/83876672129.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fuwolumekofonokotakikiv.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dutuxoragikejodugi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/wobererugovatuxaweligage.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/wadamuwareb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=percy+jackson+and+the+lightning+thief+ebookPDF 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 11232 bytes
SHA-256: 9eb2255c33a6cb7f7b4156511e9eb0905e1190dcaae261ddd675ff55a582e8d5
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16736 bytes
SHA-256: 228421365223565804d376918fe67584b51adb712120272891f16d72d61c0947
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1