Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0348cfd5e126d2d…

MALICIOUS

PDF

72.2 KB Created: 2021-07-10 06:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263d4284db4243b7d560e4456af00432 SHA-1: e151f5417e2bb490dad8c526814441626568a8f6 SHA-256: c0348cfd5e126d2ddbbc686f9e93a85344f616c5957a2bebf3bdd46ab9c3e5a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=blonde+redhead+for+the+damaged+coda+meme
    • http://castrolmintabolt.hu/images/upload/file/lelarivesunitofugosoru.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/g5r1u78focs2b24ku0gqe8hp1l/81117978212.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e83deb3a2440e26054c0edf6b149a5f/69653845454.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c4c67b7ca4d9f13e9459c94030ce752e/lozumuv.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e38b8747f930faf02d810f9cfb0ea64f/40767055279.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77af96047f---23867012194.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817149a6f23---muxaj.pdf
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/35273480513.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/mulebekapogowogupud.pdf
    • http://valaptop.com/ImagesVA/file/45375069267.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ad74debd58b8cea297aeecaa61b523dc/xujurowub.pdf
    • http://strandedtattoo.net/file/lodukudojizenozadilepoza.pdf
    • http://yjsyrj.com/userfiles/file/pupokurunipeja.pdf
    • http://centralgiving.com/media/userfiles/file/13167804255.pdf
    • https://adamant54.ru/userfiles/files/sevujaguwemanovokoratu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000ea04bcb---72839458850.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2916cda00f---wabopikilojufuvelaronej.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc8bb9e92---dilegimuwiboveked.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a07dfa49a03---nubajotidebabonumevon.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/98708690497.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1c54020badd9aa9e6eab9b0679a0cfcf/dinusawotegow.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/51oihkma6o4ils82eik4huug0i/98503292240.pdf
    • http://fotocaroli.it/userfiles/files/12778710743.pdf
    • http://blueyee.com/upload/file/200448274444.pdf
    • 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_off0000b83a.bin
a78a33437eaec49154e5c5859c857d776fadb49cf8b59bd69c7931a9b4a90b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 10716 bytes
font_01_sfnt_off0000d072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
font_02_sfnt_off0000e884.bin
fb23c31a4d1a2592ad9ae5ade0f272cc37615f858b5ddc7f6029a2f69a91894e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 16456 bytes