Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9569753d401bc44…

MALICIOUS

PDF

96.5 KB Created: 2021-07-06 08:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e54b68072b752608524d5bd815fc699f SHA-1: e9533f06ce48e57c4a906ab138b3edb3e9268607 SHA-256: a9569753d401bc44335c7cdf2ee87690b5034ca82c342233b2d82575fddbc8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://aeronautike.com/userfiles/file/zodijuwifiwuwo.pdf In PDF document text
    • http://abwingssuffolk1.com/uploads/files/26899694339.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/210d81697e8f6638404c16268e9f28d1/subivawoxixarapomivam.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb0b007950021b09d1d4bfb5ef6196a2/nunuzoxukadupibokaboraz.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/41467080605.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d5b81127---76042419024.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607789abed6f8---dumoreviliru.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/defunidobigipuf.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2f4268e4154bd5278c166f88d1d7f5eb/87146142099.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5ac7a323---fusomipevavujitesuvanivu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/juzarorilunabijenen.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579bc2dd89---35522509442.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/51653196441.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/zimikoxajonixegumegonirap.pdfIn PDF document text
    • http://flgr.ru/files/files/90797758604.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afbeeccdea2---50865975237.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/wefuzenadibalidowivor.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975115cae28---kemebipofaxatinu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1522c051d---59517003020.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5ea72c5b77b3f3492af4f852f9a2adfa/14313936400.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/67818861409.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/70313274253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=isobel+yeung+vicePDF 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_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 18292 bytes
SHA-256: b51f7ed6a4a6bb65d3e1d9e9dfef5da5fe547e07cd180de306833c9c280eaa95
font_01_sfnt_off000143e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFB 10416 bytes
SHA-256: 8fe77cb35d2a2347dba25fa05c5a863c4d8077c1465fab1da5770381421bcbdc

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