Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3683d5a5e9e4f1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc3124e05636944928d92ca9fd10785f SHA-1: b7ea6d00e627d516d7c0c5121ad1a0e885b616b0 SHA-256: 9d3683d5a5e9e4f178694649b1c57c8fa632de3a5ebdd89f096cc2d8d1693112
216 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware. The presence of 'utm_term' in URLs further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=temple+run+2+cheat+apk PDF link annotation
    • https://baigiangtoanhoc.com/upload/files/loviguxa.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/sutotevex.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/17380671914.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/33430680232.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/6941065913.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/zilakujinisapiseze.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/48671839449.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/44290983982.pdfIn PDF document text
    • https://trystsalonri.com/images/file/23382980479.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b0b00448---16153499232.pdfIn PDF document text
    • http://raczcsalad.hu/files/mujamolaval.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/emog885umjs5ghm3v79fn0nn7a/dabewonivabalipuzuba.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/48217599729.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/sagutetopugimewutop.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/madesidupufojibabinorasu.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/malobamajowetifubiwix.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vomit.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/63284695332.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/pijuwawexivijezivifitiwim.pdfIn macro / runtime command snippet
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdfIn macro / runtime command snippet
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/20ddba345ba759e6df0bc5b09da99d6d/xejatotuzofuw.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/11770880387.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dasadurofowaridesuxebagu.pdfIn PDF document text
    • http://veterinariomauracottiIn macro / runtime command snippet
    • 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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 14952 bytes
SHA-256: c539820afa299fff2340c94035c81caf3047b378eb01c5e47e613c1b6c62d605
font_01_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 10536 bytes
SHA-256: 65ecf7599a2e5d17855c03afa95c25c1c893b853941a100a529ad58c043d3cb2

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