Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dce206bbaeb302…

MALICIOUS

PDF

104.3 KB Created: 2021-06-28 19:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0861551096a23ff6a8666a8ff51e3ba5 SHA-1: e3d8fbd858ae6e0df3a4bd24751e53608bb1a8bd SHA-256: 89dce206bbaeb302b680a29332728434dfab266126ade54473af6f26ba97b9ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure as a link farm suggests it's part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://scoutpate.com/userfiles/file/2694151497.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/nesifojelutonov.pdf
    • https://clubslotalmatriche.com/calcas/file/bexapu.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/92715342621abc9397cd4cc9cf354a87/sobosivitizuvufufo.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/577d48a9335356f66c26becdbdfd7d72/71002603300.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26df2a6b7---27702827951.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/10209843037.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b02e4f0bef8229272caa47ea490b682a/41406989432.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dcb072020---85077094752.pdf
    • http://oilmachineydy.com/d/files/mozidenilopabinug.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac4c6b9e---99885425390.pdf
    • http://www.deewanalarab.com/up_imgs/lugovavaledixazi.pdf
    • http://sarlampa.ru/upload_picture/96057086956.pdf
    • http://mini-garden.ru/userfiles/file/kivojolobatibup.pdf
    • http://geniuschulatutor.com/userfiles/files/gabut.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b03e5565---92835768915.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9548ad60fd---lagefavebitamebukufuxav.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d503938072---33578721737.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b448cf5---18465213183.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/45bbced9b81e4377c0292d3778f4ff75/gijuvawaxonegoteba.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab4a6b95d---xagiboxaduxopezamadewumo.pdf
    • http://www.derbysignandgraphics.com/uploads/file/11852226846.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465591ea6e---malazufazobofasokemul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=4+set+venn+diagram+problems+and+solutions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011904.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 16244 bytes
font_01_sfnt_off00012eec.bin
949d7c96969e329880c19c122fc0b45f65e23db3f2143a48cc32507665b759a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 19136 bytes
font_02_sfnt_off000161c7.bin
39e4bca2070421dd0dbf1d3906109485cf5027776c9d4ad1348c87c9d52ec42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161C7 11020 bytes
font_03_sfnt_off00017af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF9 16792 bytes

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