Malicious PDF — malware analysis report

Static analysis result for SHA-256 172d054ad4c76955…

MALICIOUS

PDF

92.4 KB Created: 2021-07-04 15:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4652c017da7518e5dd241f1b2e32f4d5 SHA-1: d32a0e2f85465fc285fa86780343dadc6e252278 SHA-256: 172d054ad4c76955c5abf169f72193c7b8d5beb8f1eda366951d6a6cd9ffe730
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f5e15d6b---61160556237.pdf In PDF document text
    • https://mfdesign.hu/files/file/56259604262.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052703401570.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/60592609247.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8a18eca20f981679230c74ecd62d745/54750636264.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e98afd99---tevomovameveje.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e699c059---14354887381.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088948f1c778---5711027763.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/girudepam.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8b497ebe2a211745bcbe4382f1fedb95/73273334633.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/41330909460.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fanugow.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a72671a3---81059229240.pdfIn PDF document text
    • https://medtek.vn/storage/file/xidit.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0a7a322e---36572589537.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pasul.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2b743e0b---fopewoguraxisuvevamizo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fosane.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ibb55j7gdsis2viida2n88tb33/82220843353.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/zimufufuluwanixapabubo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/537d5a44d2e1240bc0812848bbb7d39d/13778052175.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/526b12ca612296e6ee34d4c1d7d0a802/61223326756.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2989238b---biboriwofimerexewinutumu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76a0b0c4d---riputigonesi.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/45467419372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stress+response+meaningPDF 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_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 17196 bytes
SHA-256: 674073620241bd95aab93d0292af0a088da126db99b038d7479fc65cfb46698d
font_01_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 10624 bytes
SHA-256: 90119bb111a4efceaccf4ab28316b7d8370eabb6abb396789f4e6e6091ec70a3
font_02_sfnt_off00014c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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