Malicious PDF — malware analysis report

Static analysis result for SHA-256 a925a63cc5fe2164…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 05:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0bd2a08824027a7d5738416795688301 SHA-1: 436fbf52a850a61b30c78b980f1d9ff1a7d88bd5 SHA-256: a925a63cc5fe216400fc2064537fb74f14a8acd328e05adf396eb231ce6bd6f9
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external files hosted on compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the heuristic firings point to a link farm designed for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://studiomalpocher.it/userfiles/files/1023509185.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614e922ea127e---nukubawenipom.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/61908167643.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/78592794855.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/mekaludutapif.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/gewufugifasolapeb.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/40829526644.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/75161805540.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/narirebusuzifitavu.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/wekulavolipiworidovunikaj.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/78363622793.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/betekewuvuxe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2fd9689f---muniti.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e0d77725f---setubesaridatufofiloki.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tijezaluzufijulopodet.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gilakewaliwodujizu.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/gubizefavepan.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/55974771724.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/26988332177.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af49ab6857---54975791465.pdfIn PDF document text
    • http://tayles.com/uploaded/nomizozadikijikam.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/jinugumitenaxifegifete.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/61089507800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=happy+room+apk+modPDF 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_off0000af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 15032 bytes
SHA-256: 0e94ce9eb046e873aa5b4c740929e3ebe60119159319751a618fb3ee6d6783a8
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 10108 bytes
SHA-256: 4cac7dc9e5b85a36b102b0ceb4e5c0aa6bbbecfe185b06c8df5af6b550727072
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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