Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bd841d0c011102…

MALICIOUS

PDF

95.7 KB Created: 2021-09-05 14:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c53f9bd8172487c296f99db9a33b858 SHA-1: 02f5bdb6b765bf803ec365abc1f0a95e125988d1 SHA-256: f6bd841d0c0111026e7733ae37b8208be547a322dcb852194f3d3368c6d3837c
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. The presence of these links suggests an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.2122

Heuristics 5

  • 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
  • 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://apskarota.org/userfiles/file/juxigejogadojunokifadis.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732c786a872---ferajazo.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/lepugalakukowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4f714b6d---1746651489.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f76434e402a1e765a03910ccddddc25a/69265580845.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/38213052806.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/31132315434.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50571766645.pdfIn PDF document text
    • http://honghuibio.com/d/files/57904931426.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b2067f3b8cea5404a33f252bf1b898e4/xutamilikisazozolumi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6607a83a9---zazapatajok.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/82882928194.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jusoredo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/6574478858.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/18298177233.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/29760543938.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04dc082dc---vimevawinufesap.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fd44e8e0a1e33be347fc98f1d7fe608d/12123268240.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bagise.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/viwifufizasawaserumenov.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/pijugukopinukibiva.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/jojugibifopawesipuxaxele.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/zuzuf.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/8318298118.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afc0a55c1---fijiwutukajinekadodadefon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=systematic+review+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 20220 bytes
SHA-256: 94ab04ebe3a80377fae9eb3a5f6548ce33d6b91a68fbcfbea5696a0ba7b8a4e2
font_01_sfnt_off000156f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1