Malicious PDF — malware analysis report

Static analysis result for SHA-256 8430229477b9f5d6…

MALICIOUS

PDF

76.7 KB Created: 2021-07-19 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 667d98e2896f0ac62451cafb68de995c SHA-1: 08587e6dcabf4b28d8c4053db0050a97c449e96e SHA-256: 8430229477b9f5d624fc197da786863c57930492d2086aacec1f52f536bd64f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress sites and other domains suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://thesnowmanicecream.com/ckfinder/userfiles/files/zebipagimuzu.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c125f9e54b3b33134ebc9a2a7bb7ba62/kozugivakiwejutomekufowom.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lomuge.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/35627584228.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1d5d2df4---gidoletumizekowojaxedutar.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/50ad563faad989f8cea6ef929f94a4d1/juwasusuz.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771913234e2---4455559176.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/zutijonorutobamofodomem.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/26dra9s4i7mqamn1p99gdgdvt3/nelujak.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f42692c8f---84147045299.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-9/20210609225150990096.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172121384519.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/gulamepunufotowo.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/83920224477.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c238b0a4d61---tezituvizutemipo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75974828a---46330870877.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/48b2008253ecd98cf2057a628c44add0/weromexosisubavebofilez.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa944d2b39b6f8044158c5fb1b04b49d/gokeziv.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af1236650ce---kazaxomejapusisijomo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/voretobarenefatadoxibuk.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/jigoviz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a691177cc9c3836b96ce65a2ca645833/ramonurifenalepevidof.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e02233b11---65087663262.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/kofemuzapaxibupevowadaxa.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jirapifalepanoliwanaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fast+and+furious+8+download+dual+audioPDF 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_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 16424 bytes
SHA-256: 991abc03a901deff365ca3678a2bbc709758008376b2d7f7d738a6a5cf545334
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 10588 bytes
SHA-256: d4f1d8ca8694a51534d4487f972870157d5ac6697007fe148f747d9b01451b78
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1