Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6fd02a6c30bc36…

MALICIOUS

PDF

69.2 KB Created: 2021-09-07 08:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 874ae4acc31dd82f4dab5f8b78dabec9 SHA-1: 790ae83a164f4ce165e859d9b8184c288f7c3fb3 SHA-256: 5e6fd02a6c30bc36ef9c9ffea82a495c084bdca2a87d94106d5a35dac0322238
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12dc20f466---80495691872.pdf In PDF document text
    • http://wadirumshootingstars.com/userfiles/file///rikezovat.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/85873211044.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/nivezasekove.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/24724463480.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/wenujedezonodi.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/32728539667.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mixisowuwomole.pdfIn PDF document text
    • http://kmsenior.org/file/files/87716394833.pdfIn PDF document text
    • http://domplus.su/userfiles/files/setelawerogawavet.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/33072432793.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1va8rh1ci7f37qrjl97pl86r3j/rejitoxatuposigiguv.pdfIn PDF document text
    • https://seikai.jp/free_images/files/7327598197.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/jowafovojoxatabojemi.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/78396982609.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1fb1ab0819e136a066fe9b3c51e7a741/piwomabiz.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/zigusekoluxagomeniko.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/xawetixopadutoguxirirojon.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/libeladedo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/kesabebajiwawusitikadovi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5145475c10e2dd58b8ac3c0117eb45fd/fixomikuxomol.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/22965707514.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dc33f5bd997---durodekijugobivewabonarob.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/13414314195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ieee+paper+format+pdf+downloadPDF link annotation
    • 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_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 14000 bytes
SHA-256: cd42c09e93c915f6966d19e0c04b6534f743a62435e387ff396dff1f713a6cbe
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 10436 bytes
SHA-256: 81b87d060bfc7ef5d8cbc55de8bff164f105168c23a8b4e2c82f712a2e489d89
font_02_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1