Malicious PDF — malware analysis report

Static analysis result for SHA-256 74686ef63dc32d28…

MALICIOUS

PDF

81.0 KB Created: 2021-07-19 19:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2574f5fa5bace4c287ea4e0ecdda8cb1 SHA-1: e34444506b050d9ffd7191a9bd1f34e3b6c16f4a SHA-256: 74686ef63dc32d28f638022d639d001290d97c1fb4e8f43c6274baac80289b68
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8bd4fb060045b71849f07a3c24ac8491/63319966805.pdf In PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/10575640499.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845e00f26fc---59414580363.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gezatijozavuganufeje.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219551949598.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/55604942619.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/13605676946.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/vanes.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/pak21pmmdokofqfodmmuk3pdfno7h9ik/wujokisokawubeguxefut.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/00dkku25upc0ldcptrl1d9i566/86821583104.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc305b90e8---78458154030.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51794ee2de---divuzuv.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/50250929791.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210703224518_3t3o7o.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7dpubcuihbd1m3b4jgj7fdrb6/laxanunedozobime.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/5732612956.pdfIn PDF document text
    • http://www.siposferenc.hu/html/35779991915.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/14757250715.pdfIn PDF document text
    • https://seerupit.dk/assens/file/89231035879.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l968epeidlmq63a1hshs36h8g5/jejukuporiru.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/35641280702.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/78319013474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=capricorn+man+falling+in+love+signsPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10820 bytes
SHA-256: d9666dbf98599636d67a91ff72eee9acf7343ab0df8123e306d677b4b539f2ec
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16352 bytes
SHA-256: 3989b645e01367b7452d19911d5fb1bc37bd1bb30065c4b9a56d777f3a67e94e
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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