Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52642fbd0377768…

MALICIOUS

PDF

91.4 KB Created: 2021-08-20 02:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76bb77154c96e5a5de9737ee18f5738c SHA-1: fe2c138e5a4f0ba0f965b6c0a58b90d8611072d7 SHA-256: b52642fbd0377768967e44c335b45eebd5d5f1ba7dbf7343c96b286f618341b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://huntic.ru/uplcv?utm_term=how+to+clean+down+bed+topper PDF link annotation
    • http://3qbuy.com/CKEdit/upload/files/dinalapokob.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/tirazodejipavom.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/eaab540d3685fc2d928e5d0dce52a5a1/susurazagisilowox.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/57865706645.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/59885447186.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fnqu98bt4ehfabt9epmk1s85di/14639998296.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506032910297319.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610546d2f2451---94650177823.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/dolesixojudun.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jeguziwetokinenuvatu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/46450259979.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/20825343362.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607673c905356---xavabovatozizixiberufili.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd1226513---38030253057.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16118ffd184287---51448972955.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070403434973499.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/busavoruwikiriv.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/kisabuzuluwe.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqa9o3hfhg3vu8ecb83bgr9pk5/rivenidoxeriwixedesudefe.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117d55643ebb---32782871972.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2031569d7---nexaxixe.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/9948905464.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63408587315.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 16636 bytes
SHA-256: 7a2588b84a15b26652bacaa74ce022b33a6f8a129cebd9b6acdd2464d020c45f
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 10464 bytes
SHA-256: c810610e36dab24f96f31c67d0ea81d574e4927134b9d986c275d6af92f68156
font_03_sfnt_off00014a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A19 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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