Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbcfce8e887620a…

MALICIOUS

PDF

89.9 KB Created: 2021-08-13 11:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f703fa05cbcb1a84d1c948c6306cdcb9 SHA-1: 6b25000fd4f5d512988d2ac55e5a17265310d7b1 SHA-256: 7fbcfce8e887620acfbd99704b9a56392a04b18cf61c8a55cf65a70a207a653a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bukharageorgia.com/sites/default/files/file/porewopunozut.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5331880e1---demaniluzoderazoj.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/95254390869.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/53046e3d70719740c1f3ed72cbe4bb7d/rameraso.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/91202897553.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d325e93dd5---96777950084.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/lufixekadamejiv.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vuwegavuzaregukexijanor.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/bodiduxutux.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/nazavukiwuri.pdfIn PDF document text
    • http://asustainable.com/global/file/gexogerujudeduvo.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/fasitibevoru.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/zegukanuvinivosakataj.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sobazodunadinikivujav.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c30f99d8229---xaminewekugumoxobalaxog.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/13499492370.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/69f5a7ec0d68630dd171657baded40fb/75241377262.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0afb43b08---fivorotubikipam.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5a7472cff5f45727ed773ce3262e35bf/tefepile.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096293a8d42c---vidokoxesov.pdfIn PDF document text
    • https://retta-bg.com/userfiles/83899638107.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66b032c969---58074313551.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/xozoru.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/46773053178.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lsev2jqsbvui6g99kfe941ajh3/tijiruxoludo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=le+fabuleux+destin+d%27am%C3%A9lie+poulain+j+aime+j+aime+passPDF 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_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 11176 bytes
SHA-256: 0e0b77e7c89beefd4b95b5803c849c9ec66e586c694b57c929af5a9714afdfd4
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 19116 bytes
SHA-256: 19fb833c32dd0f0fe20a6be7faff108946de48c8815916dd8094764875b55258

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