Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab205893b4114d23…

MALICIOUS

PDF

93.9 KB Created: 2021-07-06 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55f03694ef562177179c0dfc19119978 SHA-1: 1f94db032031ec574e1cf84c41fa3402ad110537 SHA-256: ab205893b4114d2385a15faa70d5d4af99595ac9db03b9b6059e69c46b5c9a69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to host phishing content. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://flambotour.it/themes/userfiles//files/semaforazibevanezanupewa.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebcf4d8ce1---nosizu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8c11071628484d463f045b4203fe2a3b/60668067976.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/lokisexaj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/c0pv8nvqiggfuc98ic8qpe99n5/42420688901.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e879d40fe4---loxoredifuzomudanewawe.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d826598947cc81f61dd6112a3aae36aa/62176316605.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j67b7666bucufk4uvg3d47fh7/dozilakoziwixomarin.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50833a376---tiwezuguvuzuju.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zitexejovoriwuwu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1dbca49f9ec90f6bc19961f48bf31e1f/33822485999.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zogewezigab.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/memegadofotakonimexa.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bbblolln7isco21npmb3o0k4l2/nexidinusegebu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/69058736579.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c18aab05dcd---76099738640.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e9fa6925c448c0e3805535029b725794/51957194548.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/400cac7aafcebe14d27887e6c64249d0/bajivovumapikelaloligako.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccd424686---87218343618.pdfIn PDF document text
    • http://prosquash.by/data/valov.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/revipu.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mofewaf.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f82145de2c---12615026583.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210704_8B35FFFA0EFB73E1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=roses+are+red+poems+for+your+crushPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10804 bytes
SHA-256: 3c7ad39b91d4278ba5b52fc905c84c8d983c89c567c40b9671bd0399e696572c
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16292 bytes
SHA-256: cd50eb7aab2f0e9a52beae6abbcea2f1f43057679cc4dd188eaef8d3d32b48e5
font_03_sfnt_off00013cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 17208 bytes
SHA-256: 0968bfd3182120cdcd291f3bbce78886336efae9cd79f268ca9984dfed6a5df4