Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3820b31e675f495…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c28b1990d317ec79870f3a0530c44245 SHA-1: 4395f345ca7530f2da9cbd19acd7f672c70fdb1e SHA-256: a3820b31e675f495d1b61c3978020844408f5ed49ee207271bed275c98090131
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 CMS upload directories or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dagmar-e.de/userfiles/file/55675411220.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/1194605483.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/bepela.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/defubimefozafamiza.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/52661239295.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/898b49e9a0e5c513030f37015d166fe4/dedaxigurisumevuganuseze.pdfIn PDF document text
    • http://ipllaser.in/uploads/4306116573.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kenadaxapemo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d99f8ba9036---zowotuv.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/48409866910.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb12a52ad---zobus.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1bq182548ebfffqu85gv8vipq5/zakatisabitixuti.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/51450891522e7602b1216eea5b922ee6/dobije.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/pejuludadipabotagep.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lobemeleb.pdfIn PDF document text
    • http://metallpress.ru/files/dumujozuzu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bugifowinosurukusepum.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/10463572234.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1da2ubvtcfklqah9b577a7eps4/dotibusa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44d2cdf49da55413d8ae9941f88403dd/20269771339.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210626161459.pdfIn PDF document text
    • http://sun-eko.eu/files/file/nopupagajemofotobologozub.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c19da28---70067937112.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/26393164216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=4+pics+1+word+answers+todayPDF 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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 16840 bytes
SHA-256: 56a53c24fe2f89c80926265a7f4dcab6f958da44641bb2a763d107d9a0d3950a
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10692 bytes
SHA-256: f7916c264f6d12cc20fd6da23db61616eef95e85962ceb87e9753c10091372fa
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1