Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cc2aea023fba28…

MALICIOUS

PDF

85.2 KB Created: 2021-08-19 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c30d6edf92e11221abd411af33130764 SHA-1: 4bb6b33f05b79899f982590947397a3e442d8f2f SHA-256: 65cc2aea023fba28dfdaa54dd7c7df8e3b150555fe04e5ec3c3ee3d5ea9d19e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous external URIs, many pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakipefekubinanol.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491b09c1e2---99897259235.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/puxodixugexofezobiso.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///jifukefukotuwo.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/wurerin.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/51138995689.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/zodagasaguvar.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/69186899004.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/refaga.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0nnrji5n7cbh22mdrjf1c0sa10/zanedavawenuwogul.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/wagetiwuwam.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4b54ef9012c602e72a589b5797474065/fusokafidugewewusinilukob.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53fc794bb9---67031459938.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/49728215818.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160700756b205f---febafegususojal.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/rilojajibinemelovenono.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/zuxepomovarirej.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775556e99ec---tubimosatexasuja.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/3625328428.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a78d06523---godopimeratofomapisozat.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dbddabea94f5abfa804e26a32c68a64f/60315269317.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160958b21354a3---nedakexawixom.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991c5723ce---16736015776.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958f181da7c---98620317553.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/14412411795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=static+gk+capsule+pdf+2020+gradeupPDF 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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 11080 bytes
SHA-256: 84ecddf48db3dc397ae112b55896c093711d45c15114d8379a1340a7bec6be90
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 17200 bytes
SHA-256: eb041185fb4c7390e3b2ef4c27a1073eadec5106c4cdf97708ef370aecd59dc6
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1