Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef3c796d2624ea4…

MALICIOUS

PDF

95.1 KB Created: 2021-07-07 23:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2ba74afdc5b70d73fbc69094744d006 SHA-1: 5bfd342a3b3b169be661df5223b9517cd39db616 SHA-256: aef3c796d2624ea4dcf3a16814284dc63af6527a4897713876fa6bd4c7e2bcd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several embedded URLs point to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or host phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking discernible user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://jatechkj.pl/upload/fck/file/55251263865.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kogijevotewudixapusagigo.pdf
    • https://egyptsuntours.com/userfiles/files/82139515523.pdf
    • https://catbasailing.com/upload/fck/file/rariluzeresimapuvax.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6824a9e78---debenura.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c228f15d09e---moviliwefefivilufexo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a784fab49ae---66049335143.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae3fea836.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/q9o5b12u3jp717dp696l0jfd62/55040759332.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/090b81c989753349772c4f0374221e3a/vokotumiwupojedevu.pdf
    • http://ghalemdi.com/userfiles/file/6598646300.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c321752fd1f9fa2ab3fb17fe2267c528/88124682813.pdf
    • http://aircond.md/upload_fck/file/64839274063.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pqrjsc9odr5q6qiqcd3qqhijs4/tazegitosarowipumow.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db9bc9abe653a463010b392618d63d35/lubukamelibu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb30e6e18d---15405832996.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ghqs064mp8kbniiu14fes0mbg0/41035186884.pdf
    • http://tranindo.com/Uploads/userfiles/files/52487392575.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160755a7b4667a---96493164162.pdf
    • http://poorclarescork.ie/images/gibepud.pdf
    • http://dinskayarealty.ru/media/file/88679739061.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/41404035368.pdf
    • http://asfus.net/virgsurv/userfiles/file/59837864956.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/27733228456.pdf
    • http://thepnguyentran.vn/media/ftp/file/romopujegokaluxema.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/86b77db63277859e02fad8125609070c/2765093269.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nineveh+present+day+location
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f184.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 16792 bytes
font_01_sfnt_off0001099b.bin
fb00960766df24bc681027270e5d9ed3e1aef44372ec89d11adbe99f5e1dbe69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 10768 bytes
font_02_sfnt_off00012256.bin
0e586ab97d92a94e406fd9bf901fefa2d757983040ac5bedb53deb03ee97434c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 20836 bytes
font_03_sfnt_off00015606.bin
4e8cd30f25aeaf9f3eb054ddee7c295f03a8791cd0d0c1a4c71fbc5f2b38e9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15606 16936 bytes