Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61c668316983fb5…

MALICIOUS

PDF

80.6 KB Created: 2021-06-28 02:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60789dc8622f605cb79f44202c9dc4f5 SHA-1: a5d093f2d458b898b47044ccab444ce19f7e23e8 SHA-256: b61c668316983fb553eb7f7c64b502ca31b8f9a126d16e4a3d5562d7b96dde8b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://salvatoredivilio.it/userfiles/file/worabomejaguvufokokas.pdf
    • https://askisan.com/upload/ckfinder/files/78933966688.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b770511f2---mowilurutamabotoz.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/nenokuvegu.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5982c7da57e9556f319fd06c946810ae/pavajuxusexirisikoki.pdf
    • https://tepihtrava.rs//files/47509966198.pdf
    • http://joewhitefamilysite.com/clients/59967/File/64815021017.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c12c97ae8---sitojatomolijizop.pdf
    • https://asthasupermarket.com/userfiles/file/lesuvukerenozinasekofu.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i7k5qbdte18b62937ul5el504n/wenaroxuwuwixiju.pdf
    • http://firstcuwire.com/file_media/file_image/file/wenexifopib.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eff39a328a75fc55a2caead61c31048b/juxukegezowedivo.pdf
    • https://atraba-holding.com/userfiles/file/9884763582.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/53423781918.pdf
    • http://driver-jazda.pl/upload/file/72168881840.pdf
    • http://ranaghatpchsschool.org/userfiles/file/vesivazinafa.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6puod34vjiik9r7pgphsghoi87/58518581487.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e8d54b74---33167248787.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gg8ji7al8uh9chkg9vig0r9j2g/gotenalu.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a730a10fb---36472619759.pdf
    • http://studiolorenzino.eu/userfiles/files/92323912701.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c4ad957b---64450365245.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/503f0561adbff0ad63481ee4015b5a9e/41133619735.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=where+the+mind+is+without+fear+rabindranath+tagore+poem
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 16792 bytes
font_01_sfnt_off0000ec3a.bin
5c3a59d48ec23abc6771d9d879233fe746c513897505be902dca33895a4adc67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 17240 bytes
font_02_sfnt_off000118fc.bin
8828911d515015227b7160326235edc0919c5a289740085dc4aa6b7f61ce6e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 11220 bytes