Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8a32e4a3e6b7c6…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be63676b2ab5271759579353efb0db9a SHA-1: 158bf9ac23cd3246272448339063663739b1ebcb SHA-256: 1d8a32e4a3e6b7c68063809e4f9900f836fc4a84c2e756b182bd65c35d9ccf3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing or malware delivery. The PDF structure and embedded links suggest it's part of a broader phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=what+do+professionals+use+to+do+acrylic+nails PDF link annotation
    • https://mygoaltv.org/ipp/images/uploads/files/90021442640.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0b24bd9f19cb9816e807c40e5bba97f4/82482181678.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gapk0296svevdo9u6pmk7r3f77/kinolerutakitowigezazanug.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6b730bc7---zetexelazijedik.pdfIn PDF document text
    • http://liyangah.com/Upload/file/tabuzifelopadebigerow.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/temuniwemaxosefuz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cf346221---wujurataladip.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/vakabadozesofisa.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/skf07do87eng36mtc771imdmuj/9417442147.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530015540.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e6807981---nisijowoxelofajux.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e84f89d71f9---pegapaxijaxewosimuginedap.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d010841b08b2ef9df181b61dc4f01b88/mukopedofenowivujozisit.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jiwuzonitolu.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/zunukuzifojemivu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa5a59f3787504d526e747413b3c3a5d/79657903956.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061315032772.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2d2e58f479781088a32811255cb305a/30553452771.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c8c495f0af2accbaa4cbc6c153721b8d/64647260175.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zedibuginabuxatixakizatin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9732d08fe8bab9b0668bf4b6fc5191fd/11747477137.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/40082410758.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/eaa08a1b995f2a8ff39ba5f0e39082f5/jawonuxolifap.pdfIn PDF document text
    • http://saydersan.com/firma/files/69300206832.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/pusapozozalemazu.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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 10924 bytes
SHA-256: a3fcdb45b97881e7f061121b2aacb2f3ec1f1930aab19a1114491f6d504fc6b4
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 16252 bytes
SHA-256: e504abd96814d1f81f798587d82be691ac76b054ebd5edc7e1478da9d0ddf3e9

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