Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d9acee8fae267c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 13:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bd07eb82d76ba3ba7584a72a1a003d4 SHA-1: 74a35471be786b7758f5747c4a0772a2437c1522 SHA-256: c5d9acee8fae267cffab904153221cf7cd474abb120e1c1f20d85ce4fef26eee
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=zelda+breath+of+the+wild+rom+download', suggest a lure to download content or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=zelda+breath+of+the+wild+rom+download PDF link annotation
    • http://ajej.pretty-match.com/upload/files/60794289306.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dapisutegimunenalevofuw.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/nojodakodefige.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396f2c133e---saxixema.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459ee630e07---zudexaj.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/76869231068.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c28884026e---lerexexupijonaduki.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kavoretatuvikepetezobebis.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bajasosetuzabiwax.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bowowujotimu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/12266966797.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zuzumisazex.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/webufomolotepakudo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/69754464526.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/47773460221.pdfIn PDF document text
    • http://hiniceshine.com/upload/70428849820.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/ramoxag.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/bemesatuluripoge.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/meruma.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27273398297.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/duwogon.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xutakorejiragurufapux.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/70053234583.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/nerujifabisajulaxeta.pdfIn PDF document text
    • 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_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 10640 bytes
SHA-256: fa88d4de9ae381ce8a74e95aa711b74617df62a2f0a91cadb543a194a1652cfa
font_01_sfnt_off0000cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 16416 bytes
SHA-256: 5b811a192a65a50c070fcf3f8c7bd99f0cb55e52da328728378ef700036888ba
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1