Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd535b8ac802c7a8…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 13:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96d778edfecc4a4f7c73db8473330e5f SHA-1: bed175e8545e6d098757e29dfff51e3d23d6a2ec SHA-256: dd535b8ac802c7a8fe32ecc19e612f62805dc0d5519202e813b9100b0111a46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e87e3e2434184067b56bc1a00b69d38a/defabamopifuta.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b5b34b90---kobagagukozijowijimumugif.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a84485212a6---zikefodewi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/222ac65c63a248fca3c5865a52be44db/7148557554.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/97355218997.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vunaritaluduwikad.pdfIn PDF document text
    • http://azizolace.cz/images/file/tewegawufut.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/25459044340.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/84756811765.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2e2343b4---gezuw.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zufajosowox.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e2700fd7---4184722514.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1facec1dbf---zurot.pdfIn PDF document text
    • https://timminsrenovations.ca/file/iu6fEPRkqefVO7qY.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/71139498604.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24bac70e1d---xujizukemun.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sdg2fklel6u8df34rpalkba4ic/43281534135.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nuvapi.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/28497157242.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/fujopikidixovipaxub.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/5431489532.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9605bcea21---rulawitavoxewadelogofumi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab419f548---37754568618.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vumibebetatoxasodijediw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=k%C3%BCndigung+mietwohnung+muster+pdfPDF 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_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 11104 bytes
SHA-256: 06e7c4cca23975906c151698fb065a293eaac46df8b00220b49edbc5e9d6e768
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 19696 bytes
SHA-256: a24f15968095e7bd42e51d6c603323652a6b4e4e1ae07732079ac91e60d68343
font_02_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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