Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da8877fb0e7c9ef…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 14:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 064ba3fb43b00eac5b1d7088eed2165f SHA-1: 9f2f5cb01a1704b46880357a6d2c24a71b398bfb SHA-256: 2da8877fb0e7c9ef9df1c946051168b5b7c0ffdbdf0c912c3a9ba81f6f6eb087
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of multiple link farm heuristics and numerous extracted URLs, many pointing to potentially compromised or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lienlacanien.com/img_pages/file/60014709281.pdf In PDF document text
    • http://le-bouquet.be/userfiles/files/naxunoduwape.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pofimugerevasil.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ce562bf2e67c8f708de3a1e935448c22/11934786595.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/romemasibugamagewip.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/xunabimopo.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/332494364.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/56977189539.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/rodemimoperidepuze.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b725417c6---rufuvizejebikamegexorote.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/zikoda.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24607664099.pdfIn PDF document text
    • http://cpils.com/userfiles/file/razojijufabidusato.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/47570506945.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78d99ca61---31848689308.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/gawepam.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/buxopajuzamavuwuzijudo.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/9022556218.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nigesofagulodisugawosut.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/tubaxadajed.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/witixutogabupusitugurudi.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/nolozakekutikujagikana.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xopane.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6f38d956b---97414901406.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sutafonibab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=white+rage+the+unspoken+truth+pdfPDF 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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 17628 bytes
SHA-256: a14310094b02dc3c8eff403fd443539251397095016998ffdedc43072c66c1b7
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10916 bytes
SHA-256: 37c78f02e26b472192965aa1c1ae83b679b3c53bb0fa2d9dd8f82ddda5a79cfb
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1