Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5c98d32dfcfd4d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7eca983a969fcd7979c2c38ca9a513ec SHA-1: 90b392165cae9260d5f0353a6729e5756e39f57e SHA-256: ff5c98d32dfcfd4db5bdec7d9a436cfde72a6023d0238dc3aca3f25be3274c30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The primary attack pattern involves leveraging these external links to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://allytemp.ru/uplcv?utm_term=cara+cepat+belajar+bahasa+inggris+untuk+anak+sd PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9abb8bbf3ce5019e4d4db9feb06d7d45/98031178819.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/66826185858.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e58ee50e3---losonosomini.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/78658778830.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944580cecca---gulifuzisuzeperaf.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/jamesososupenupej.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a3702d44198ed0c5e4cd9c1bf463772/zulugila.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/12710326556.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/24614986793.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e27cc4a7ee1---rodumudabobuxesatazupo.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/99151402679.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/15038025710.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/15839636967.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9260359f35---74557247794.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gudedoxa.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609911b404d70---79185753249.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061319551611.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4ecf1aa5d78f300e85da2428acb1dc79/ruzewo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607940129c6da---jebemarekeboma.pdfIn PDF document text
    • http://scro.ru/pic/file/33224219040.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/72951901919.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/zitimugijabibitelu.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/wafipejunenisepebi.pdfIn PDF document text
    • 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 15996 bytes
SHA-256: 7b70824bdaead5c00e400665ed52c0423a1e488056dc6ca888bfb54afebeee0a
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 11168 bytes
SHA-256: 1d7eeba1c83069b8c4b4776e0135439755be42e39a985576c7cc29b86f17a0fc

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