Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44c2997bf53cc7f…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 11:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df5ae4c2cf1d39f78afe32b5cd3da0f7 SHA-1: d0e69c82a407a292c63712b4888f62ea9c72669c SHA-256: a44c2997bf53cc7f77010f5a067d279582a27659214768e7812a2558462fc905
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://newtech-utm.pl/userfiles/file/pemaz.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ca0e632e7b632022801cf9f24d9cf2d6/75620642690.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb00b05f2---rotadelaxamupumipoza.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9bf9f640---gagul.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d035d01a14a---85829077601.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d950e2e8fe---funoduti.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dd4h0cl5esuejta10u0b5n7jt3/30078193913.pdfIn PDF document text
    • https://bczenekar.hu/files/file/62850269432.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/4kp0fo5um1vs4uqdhtjm9qpgt9/wololenosebuzifubej.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fobufojeloporir.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/ruxumeziluwagezimepa.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/lb8f4g9s43ldm14v99rgc9od7d/lewuzumurobijafirisajoko.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe669098---rapowusafozarelukelubu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ro35luhn4uosvkj7ho1oakvjp2/96143258942.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d213d505bf6---supogerijudusolija.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890a2dd9971---defileziki.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c882c154cee---rujewafozivalogumonu.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/12272531501.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/wifanuxesurajidewofej.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/98697543433.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8aa7c82c3---kudoxu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/da1936496ac5beaffcc6bec2a8d983b1/musemedosuviverav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=price+elasticity+of+demand+exercises+and+answersPDF link annotation
    • 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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18164 bytes
SHA-256: 295edf2fbdefae86fe78d2e48f73c3493bf3846129a3436fb1fa7eb9755b408f
font_01_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 10940 bytes
SHA-256: b4154ca331d1bbffb4451a7601145faf69c4a4019895a5542b54bdbc6c167f11
font_02_sfnt_off00013e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1