Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae84982bf70e1db3…

MALICIOUS

PDF

74.6 KB Created: 2021-06-26 16:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6767ba2c4942ab832d5ba9f68754619a SHA-1: fbe99d511dd779f0269570bf0f8d6da5f0010269 SHA-256: ae84982bf70e1db3f2ca5cc2fe0f834fc5f76ef6bb9308e6acb0dabab8365d0c
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of link farms on potentially compromised infrastructure suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd2f7249f---74195996135.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/orpcc8g725qv4n4jlv6cd2i60k/91455764098.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c501826af---34592935081.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/eae9317b764ecf3764c788af1804a5ef/kezanizetorugepobeta.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/qi9tmpruong27l0nnhge39pg9h/62059698396.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ca585cf6e20fe2e5715061356354ed85/vuroxenitililetifijid.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1f2dd684a38996657677f0c799932dc5/fixisat.pdf
    • http://lucann.com/Upload/file/xitiwukegoganejejafuf.pdf
    • http://aceonlinementors.com/userfiles/file/tuzosabamug.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4c6gb2du4hbcl3a8kfbqlerna/xififaxufevukagiv.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af20567c3a7---68171295435.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/83bcad8d5c131174f4a18ed9228b1308/butajuzerelari.pdf
    • http://kaies.cn/upfiles/210531122708886844nnkiv9.pdf
    • http://botosani.ro/img/uploads/file/40461697781.pdf
    • https://vicotelecom.vn/static/source/images/file/91904394453.pdf
    • http://ifa-astrologie.de/userfiles/file/99567400696.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f2a164b225e56b27eeacf9caed4c337f/jegikerexuvapasuven.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e3087e73021169d30fa019f965c7d28e/51605873199.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/rajejanaz.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c075c80f---voxilem.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dbe7cdf0d---58423434564.pdf
    • http://sskj.pl/userfiles/file/64096539599.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/63b55e76120ca9dc889eca73a724ecaa/5764031090.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/40764824485.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arsenic+lewis+structure
    • 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_off0000c367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 16792 bytes
font_01_sfnt_off0000db7e.bin
c90c04bca6d41c478706e1d9d3cb3107d91843afee8b16d1ee3ba729012df8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10108 bytes
font_02_sfnt_off0000f23f.bin
eb87fe8dab751ae8cc7117b5f21eb17997d66fc11e1e1cfa69de636d3b819cde
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16636 bytes