Malicious PDF — malware analysis report

Static analysis result for SHA-256 e318cda37ae3c478…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 00:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a7fbc42513a019d547a1f8d0021178e SHA-1: 971c2692af5c0ec876cb77e107ed0568a1f99cdc SHA-256: e318cda37ae3c47821e2d7eafbeac394142778cb42447d7bfa9765c69069cf22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jyapa.com/jhuoyue/uploadfiles/18474862530.pdf In PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/parebiduruluxipog.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/31261200177.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/49927877410.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/vixinobu.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/92655182534.pdfIn PDF document text
    • http://hnspkjx.com/d/files/samig.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/bopexabuvij.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16136248b9e7ae---fupinagubufurujofibemega.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/pogevifugikox.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/88607963812.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cc5ba48251cf6e7f373f2fedcccd8b5a/piduguli.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c848d1bf3fcb0fe73bca0846b356a113/linepubikem.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/99080539496.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0501cbcbf---bituxete.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/95483454966.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210901_EF672D18E9872395.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/rojukaden.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/dudefage.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/32858058835.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/migewunufek.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zupitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grey%27s+anatomy+season+1+gomoviesPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/14412523518.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/84615845888.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 17556 bytes
SHA-256: 5e7788ded119d235a78947515c23172edf43086d4c2eb46655bcc849f179db54
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10708 bytes
SHA-256: fe9c726638fefd27b2fb1f2531973f5754c5fd1d38c412d46e5fffbb8821c178
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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