Malicious PDF — malware analysis report

Static analysis result for SHA-256 660beb592097ce9a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 21:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56f3b654405576ef99ff2dc78b705184 SHA-1: 34b377397cd989d6556adc271ae87531127f3c6a SHA-256: 660beb592097ce9aa590f08a38faa8346c855a62b411f5f3ecd85a9bb21e9fd8
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=sound+pollution+notes+pdf PDF link annotation
    • http://hanlacsclub.com/ckupload/files/94593258292.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kebibizusewasaxi.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/jawikedekulakuworuzagadu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eed5c818f---18926379187.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/38725776093.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/vojelajawuvikafe.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/kazufabemefit.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/ganapavumifif.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e6d427cfcbb77887a655b0183b220033/37316823412.pdfIn PDF document text
    • https://hse.tw/upload/file/xejizu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zabeduxakujotusodazol.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088859766b13---fenip.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bb5f0f93---66287477987.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c9206488eb2---63893461406.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cbb7bd1c3d648cbce42b3d16eb6c37c8/82516252006.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/2644018661.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/52196623976.pdfIn PDF document text
    • http://master-br.ru/img/file/masetadabize.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/540769927dcd65c11d8b13548b479d35/88214658158.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_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 10404 bytes
SHA-256: 8098ab786c52f835788762702a028175a0f44c38146c9eb877ddc89b1b484167
font_01_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 16408 bytes
SHA-256: 8c98047b374f2329a3a4b416c0600189ca6500b4cbc1711215f96d1c59da0ac1
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1