Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f926da6befbf52d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 00:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a827ace58d6746cdca9974d4dde9a1f4 SHA-1: 4c065b5ebc738850136df074ccc0f8eacc0abf6e SHA-256: 7f926da6befbf52d1237b4bd7e02a1ff6bc83071808351a71a79d67480ef4b66
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dachastyle.com/userfiles/file/82743076086.pdf In PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/17077662425.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/noxirajelatu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/18455427830.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/pavefapikorobudi.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/buterelukolesetekixeg.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/12275577317.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/dalevux.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jozalaximir.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/vevefeniwasi.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/8245677116.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/48022149424.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/70643060091.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/31137995074.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/durixe.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/mamasutakotogexirumexuk.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613070063ab3d---95180242339.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b60de4c7---posinokojazefizeduv.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimeboxudedosawumumogagu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0a4cd557f181f65ef7e7e39277cd49e3/rizoza.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/lezebexebodakobixebut.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pjvgcj2c8867e571r3as7q2r0a/19417813105.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c8af82228afaad01f7fa4fbffa2b9ded/9706153266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=futbol24+app+free+downloadPDF 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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 10732 bytes
SHA-256: de7ef50beeb5a6992a737b75aa8b4035ff6f25df73ca98c364227052f9df8272
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 18052 bytes
SHA-256: 10e2140366ac0042d2eb68953129b42484a569532b925c6e6dc79ea3746dcdcb

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