Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4896fbc7f43f58…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 22:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8045110d72c8ee8a916c7a27444610fa SHA-1: 4573811ecdae2666e181f8bd7f9241fd24711d31 SHA-256: be4896fbc7f43f5813b166f3bb7bff79a1152f81ba0e3e305ec6662d416951d3
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 contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://queure.ru/uplcv?utm_term=can+we+play+3ds+games+on+android PDF link annotation
    • http://www.ondebiz.com/userfiles/file/44835448254.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210913195349.pdfIn PDF document text
    • https://onecre.com/images/content/files/12377753736.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/gizolalokil.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/21f9b886b78ddb988c9a04edf02df52d/94580785783.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/28209795551.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/97532325034.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/42052401480.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/71185426498.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/kujibitekebaxaji.pdfIn PDF document text
    • http://clingac.com/d/files/11824439914.pdfIn PDF document text
    • https://arerp.kr/data/file///54850049269.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb275122f1---56691460505.pdfIn PDF document text
    • http://atomleasing.ru/media/File/36411514249.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/vowetarolelewavazamur.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135a961725c6---24756570801.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145a55c29008---67499445792.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/47931820639.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/13963774875.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/30149312431.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/63258709696.pdfIn PDF document text
    • http://mebco.ru/images/file/xeponotojopapileto.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71389362518.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648363150f---rudiwox.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/342d041803d2ef6276297709cce46a99/44273586481.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/zititotabowadetiw.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 11040 bytes
SHA-256: f769ae8d4205345a53f7b29444cc6ad4e0ec8c8a33d5db47b74cb1b7fc7c2f8d
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 17952 bytes
SHA-256: 219132030a8f1e9b716b343b9070e74f8ddfa7b53a2dbc3b3219f6109cc79f09
font_02_sfnt_off000133ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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