Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fe398535fc98bc…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30e04e154dbe0b287eb48c0575f3a28c SHA-1: cb437c33b21c6b1eb240d81ec4327440b2056968 SHA-256: 65fe398535fc98bcd7c613b5cc3ca1900fee2b10dc73a43830729898109d2b0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites. This pattern is commonly used for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5aintivhrm6tni1jh2cafjg3vp/98664087750.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be90571d567---nelekibabat.pdf
    • http://vtvxm.vn/userfiles/file/20534547082.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/q88ii943d8lijj3dtfmika0lh3/doximoguzorotep.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8cabecdfb36080f539b5c4dd0df1b01c/93777918441.pdf
    • http://3will.org/soubory/files/348625550.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ca1b11db---rojuwute.pdf
    • http://hoshitorionline.com/uploads/files/vekiroreroripejovor.pdf
    • http://nuestratierrapremios.com/campannas/file/37588867302.pdf
    • https://infiniteprospects.com/FCKeditor/file/27803064683.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/19022245123.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e6ae543b736b48f4b1340b5193c9f857/47497556082.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c72a082a226---46947964458.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/129878367.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/ruwajenadimogamobiwexit.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde48915ed---59488236384.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e7982d901---jomimagap.pdf
    • https://purefeeling8.com/data/file/86148048744.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7160aaea2850a38447620fde5b01eb42/jifinagusukaluvubipodo.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/59799287994.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f15414c39e0b9156221f9c40163a6ccc/73049574453.pdf
    • http://v-lukomorie.com/uploader/files/kilogoxijufala.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=liveworksheets+action+verbs
    • 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_off0000e6b7.bin
c244e56da73240e02cf7ee96d8641dc871c557f32b818050b8505638ebe1c1d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 10620 bytes
font_01_sfnt_off0000ff12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 16792 bytes
font_02_sfnt_off00011724.bin
9c4cdaf5950dc035579daa83c1ea155776d7f0ef1e1ec5a8aaea0f07c7ca6ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16440 bytes