Malicious PDF — malware analysis report

Static analysis result for SHA-256 c084366249ca74b6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 09:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11fa4109a8b09bcf06434677d3847be5 SHA-1: 76398a38be88ff1788b87bddffc5e47159ef00aa SHA-256: c084366249ca74b614e18e83f274089ef7a5b31ff148c4cf157a90cd98cb4b6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external PDF files hosted on various domains, indicating a likely phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://svatba-emi.com/uploads/pages/files/tagekivo.pdf In PDF document text
    • https://hpsoft.shop/upload/files/xileran.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/zegexamixulutoka.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bb891b3---28616887112.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6e979b10fd849af8699de9a895d3e13e/2114001675.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/tuligifej.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/wemowovogolulereke.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/78494590523.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/50680607642.pdfIn PDF document text
    • https://digireg.cn/upload/defomotasujipejufulix.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d236aeb3898577a8506344fb26b001de/pixaxob.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/66373973609.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/78052425880.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/435555061522bc6811191d3eac72d9da/renur.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/dekugeru.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/48354357401.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/venapigozuritulifogado.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/96597847532.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/45746103107.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/kesowipimifigel.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rur9h4p950r4kvuqdsu1qiuc87/jerivoditupolujiwepodalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ibps+po+model+question+paper+pdfPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zanaranevoxosigaw.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10996 bytes
SHA-256: 2bd7fc7cbe496a61da776a1b12a587c0c858f75119c0ee0e4bf8a612811a7d7d
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 17616 bytes
SHA-256: 4af589c5d1dda490db19ffae810c8048ad42bfc2840c985d3a870cd321ae03ab

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