Malicious PDF — malware analysis report

Static analysis result for SHA-256 159b58230b8a550a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 04:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c3dc123063eb71871408e5b8f0fb3b6 SHA-1: 0b016b0c7d43fe5aa6b5480f9d08edc2dea6adf5 SHA-256: 159b58230b8a550a02fd0375cf5ae8caa88e9dae776d15843e9eebd2f56e3ad7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download' button heuristic further supports a deceptive workflow. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is intended to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=m+letter+love+images+hd+download PDF link annotation
    • http://wami.cc/data/files/sexevatupojasefodimuwadop.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lizalozemodez.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/944ae9b6e88dc26b007352f8fd401654/35535829928.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1a2d9fc06b6d8d2037a021fcf2852d08/taturixoxefonufijaruforar.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/sa3ccouqk2rkdben0a5fq3m8b3/gutusozuperezonerilotifo.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/88445964613.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/37015677514.pdfIn PDF document text
    • http://fields-on-earth.com/fudivawal.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/g2mj71sp9unq76ieo2dmf08oak/ladelazajimetunojusomalul.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/nufaginuz.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9853b58a821e8f3c59b5734764cc103b/juzobu.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/18446449785.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/girikakumiximasute.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dbabb710b1784ef65af32c49cd66ad07/8900177818.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16072269b94d72---42359357318.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gezezakebafa.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/dedavubu.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/97997635169.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efee47c4ab6---76055799400.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a749e29f43d---29774586479.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/36661526ef7c7666b42b21da48ba45d5/15247797104.pdfIn PDF document text
    • https://etimes.mn/uploads/files/66706118377.pdfIn PDF document text
    • 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
stream_004_off0000c8b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC8B0 17660 bytes
SHA-256: ce4ca4a695586c7aedc3bd83dcb9c004dabd23728281591e43528f8b712e3e16
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10840 bytes
SHA-256: 0e53f2ed665a9d4fe8dc16df49db17137ba25f53f04a96f04d5dd4bc390dd93c
font_03_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16592 bytes
SHA-256: 83f99405ee7ac7b4a7cb5594f41a6298cdbd3acc8942e6872bea522649d8bf40

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