Malicious PDF — malware analysis report

Static analysis result for SHA-256 c209b7d64ab21250…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 13:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d29f250175e20fe1afdea0abc97d001 SHA-1: a4b1f4cf3db26cec60d445a2560d86385a2dfc7d SHA-256: c209b7d64ab21250625556085e933b11eece05cfb6dd76d4c62580792cf9b0d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://synerhu.ru/uplcv?utm_term=pokemon+journeys+stream PDF link annotation
    • https://afmiletisim.com/resimler/files/71658711959.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/6980209586.pdfIn PDF document text
    • http://cabini.it/userfiles/files/24600867972.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nodavosupozogijijimixe.pdfIn PDF document text
    • http://bubb.cn/up_file/file/6324402832.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/putosezetulodukanitujem.pdfIn PDF document text
    • http://labotinnghia.com/img/files/727004104.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3a75eb71---pewoxedosejonadijanez.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/simopufifijosodupeba.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/totunoxopukatoziwato.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/56805301289.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/8842869466.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93sbci6dbrm3t7jhnp1a7o5s7f/99912984222.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/gamaboxaxodigojitim.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a2a964ce48b3f2623e6f3052d12b2c37/28376955471.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xexavowuwo.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/bixitivepin.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pamatawadujirasabobepiguk.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/devekaxamadimotosujabup.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/repemeguzijodufanug.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/rarobito.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jerufopimese.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://cl-metalparts.com/d/files/wasob.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/96351515295.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 17644 bytes
SHA-256: d6ac169614638883c2bb566ff760383e23bb23dad83480b7f0948bc9c2e71dc5
font_01_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 10568 bytes
SHA-256: 75fc42c85cc748c97f585ad3d7c1d1ebcf9e77c5363d45bda74c7399d4bba115
font_02_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786
font_04_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc