Malicious PDF — malware analysis report

Static analysis result for SHA-256 5437168f37734805…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 22:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 565af1fca93e803178dadf1d4c1bd33a SHA-1: c7a8dfa9d6538ed788365aed5995c8f239adb462 SHA-256: 5437168f377348054bb33550ef3c8c05c7b4ecae301427c6c8110a39c01b86e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5dcbaf3308e9d07ecdd27bc1fe07fb72/tiloxisavopofoboji.pdf In PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/65667699163.pdfIn PDF document text
    • http://nemalipics.com/kanugitokelex.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614076abed355---kimusa.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/xofowavonadekowusifaf.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/73125150500.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/kelimelegej.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/ninewoteweg.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/daguki.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/777p5gep9uh66sf0ocdbdef45m/vujosifafakidono.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/tubipexik.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/16371883482.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911162422.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gixovavemarusalofa.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/kibitulilafusabuvivinon.pdfIn PDF document text
    • https://interconformity.ro/images/file/73656854729.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bbe68di9ufoe29gkm3kmasqba3/83018300272.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/dijiwufojumuzagafaxetibo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d177ff20---94525233887.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/65168565537.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/lejorokafuwuremokuri.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vekojafalokakivovudirude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+downton+abbey+online+free+123moviesPDF 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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 11484 bytes
SHA-256: 17888b3f87c53583b87a169f5bf58808dcd71ee86cd5c743a61aa0a8564ac0cc
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 18352 bytes
SHA-256: be64148b548a98b15c398340bc3189662b4422883ee95e499b864f6d3e95affb