Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4aa889217541c1…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c20b6c949871e5f310339b558d18d428 SHA-1: 7e259dd7229e70d12cadaa53383763bc1a664643 SHA-256: aa4aa889217541c12475d091591e8992e4242e3a17c6442c2e8a6c1bc8180252
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The heuristic 'PDF_URI_IP_LITERAL' indicates a direct link to an IP address, which is a common tactic for malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://photopuzzle.net/userData/board/file/kepagosekag.pdf In PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/sisozagutejepeju.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/konilasotosugigu.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/35474492631.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tufinuserawonuvomiza.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/wawubekituwidexeniro.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9157318f1---16472419064.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e42f18f68---68861728381.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16153ff8382548---xobazik.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/nedar.pdfPDF link annotation
    • http://alles-vom-schreiner.de/userfiles/file/92387022117.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae083671fd---70369021830.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/zilezazos.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/82344199844.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/73138692848.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3bd126b3ebef505665eaa5acb8818277/77427607499.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/jufus.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45461695273.pdfIn PDF document text
    • http://gr-chem.com/upload/files/xipupelefivaxigisuj.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/zovisubale.pdfIn PDF document text
    • https://iwistw.com/upload/files/webetawajisezovafo.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pifijodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dual+boot+ubuntu+and+kaliPDF 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_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 15336 bytes
SHA-256: 018eea5bcb1fd10daf616d6ce364c170cfb29d3b28d6205ca07c6ab1d06b4e2b
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10172 bytes
SHA-256: c34739edb72d766541ef44c75b400bc0f80c5b14439090a7ff11b45753f31b76

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