Malicious PDF — malware analysis report

Static analysis result for SHA-256 711443d72a2cf865…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 17:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b344725cc56c4eb92658732c39868238 SHA-1: fd4f008c25b5e86adbfee720389c49d566d4b7e0 SHA-256: 711443d72a2cf86585f17f49f1de75f7f894dfd6200730a8bbacb3ac8e2bc774
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised CMS uploads, 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 are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://livestocktool.com/d/files/49864812401.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bad8943eed7cf19bd31081a3a128e0f5/sowinikuwarefusun.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/79523536353.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058ee52293---80362388306.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/66644390262.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/famus.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/doxafivamoxa.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/mokidogazobetilalotudox.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jemusu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/48351574706.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p0p6fb74vvlgnl76lds2nj1uk6/36851119864.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2d250d2e4518a080783bc869fe7d0ce6/18053689448.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a85d16d59---xosewobuwexuwowanamokuju.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcfb0c108---82500513575.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1915e6c3---48013401972.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/zerapoli.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/77082094917.pdfIn PDF document text
    • https://bfull.ru/uploads/files/bunap.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/83600567460.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1b25ed5b4919f09af40b5618ad1ffa38/rigipekanavojinumizoz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d3d67dc---lofotirujoduror.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32983534110.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/73152409200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fuerza+sobre+superficies+curvas+sumergidas+ejercicios+resueltos+pdfPDF 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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 21656 bytes
SHA-256: f988f2077a81368bd5a9f5d985ffa368993266be24113950d871b6cfddbbde2e
font_02_sfnt_off000116e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 11332 bytes
SHA-256: 2c795fa44d311e496ee7aa2de576ef4a2fc36dd4528a03a54196e6237c5d977e

Open this report in the interactive analyzer, or submit your own file for analysis.