Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03413e85add0517…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 12:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8041c2d8828740b8a5dadbb7f5bab264 SHA-1: e3f5d1f82d46b53260a9f7eb9cadb2ca8205eb02 SHA-256: d03413e85add0517917cf99ca918c01b09d6d0bbb6bca10aa0cba4d0053da1aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript indicates it's used to facilitate the attack, possibly by exploiting PDF vulnerabilities or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://health-bridge.in/upload/file/palujidotijasitolowir.pdf In PDF document text
    • http://textstricker.de/benutzerdateien/83926551897.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/zinanenofog.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/13117048938.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/91061591588.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/muvuvufumatoraw.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/83841474956.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5987f024---luxogil.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/xilasuluperixulexobipimap.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/30613501367.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/16280086087.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/57068878184.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/suwewusafaditujomimabajib.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0ad771db---95068351064.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/36627255584.pdfIn PDF document text
    • http://abworder.com/uploads/files/17517475778.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfa024c0d---fepijofuxanat.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/55172363137.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/26197545968.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ol8vfuec6vridbjqld642h1tv5/wowexaroxitonizobelepev.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcvvhebodsg6u9075ml8kcvff1/wudulegajulumirujafutinew.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/76725393029.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/lataneti.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/76991912678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=drastic+mod+apkPDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 18516 bytes
SHA-256: 19b84a39fc8385083f0dc62022772762b03cccdd090aca2a310f864ab9cef394
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 10488 bytes
SHA-256: dce0db43feddbee309f87ac9339b83a10fa9787d65dc8aab429aec9d0a56ec27

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