Malicious PDF — malware analysis report

Static analysis result for SHA-256 227aba0979b1b599…

MALICIOUS

PDF

93.7 KB Created: 2021-07-16 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 96751258097690be79efb406bc5b49f7 SHA-1: 0cd9a63446ba099fcbe1640f950ef01775206f18 SHA-256: 227aba0979b1b5994e63e1407d5e6b250b482b2b9f23f800f1615cddf36ba8d9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e8fb8d29c38e48e1915fd0c530a57565/5214839611.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5ca53f555d842a86ff1cc413b81f38fb/bizutezefite.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca23dbc3af---19041822513.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/ridewasiboru.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p1nfcelo0r3p3bo0e29ahcf81k/11165913258.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/62248835277.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/27869760739.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/22153335604.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53471c5a1---14573585637.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68da997a411c62f484576386a7ff4e7e/75687562158.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/rasugo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160924c775a5a1---pesiwijo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4fcf8c793---mipurosaxegaviwasosilu.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6d2c3adb6382d2a589c86c8fabd470de/4408820420.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/64327ade5727164b8540b0b59bce891c/95061573815.pdfIn PDF document text
    • http://maihome.hu/admin1/file/76814942088.pdfIn PDF document text
    • http://rayer.cn/d/files/kogotomazemivogotul.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27825034008.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cd28f822---18952449648.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509132113284.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jevubid.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/52195051627.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa079de8271---jevarirabikavopak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=red+bay+coffee+roastersPDF 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_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 10528 bytes
SHA-256: 208bd991af4599fb2821153db41a2905edec42d4bb86db4b6891b7f3b435f467
font_01_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 17592 bytes
SHA-256: e0bacc6515cc85ebfca58569a4c937b01a4538e6e9d5cee389fc42cd2824c4ca
font_02_sfnt_off0001516c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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