Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a1de94a2ffa894…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 03:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 82388ec3ca8304b42d4af70cc3164bd9 SHA-1: 546decc1cd0e41be8fe78787fce85b6c6b5b29ce SHA-256: 78a1de94a2ffa8941720ba708c40574b3f0299cf126d2c314a8690de2ee26253
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous links on disposable hosting reinforces the malicious intent. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/g6p9mdodig1evii2k1cfv3v933/fazero.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a06551f5---66829746229.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/38171604787.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210623062739.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f419f7d8---gajalepitokezusoz.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d6ca699878c76a009552c5dba194cdd4/tezedavetanevikisi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a4132743---41105066586.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/boguvaburokis.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820372c9f30---41254420052.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/bfhlhq5jii48jo8hnoj0qlekpa/95774267425.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/kiderategewigidozanezawik.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5c0416bb3789aab3bed5cf0d9f41a842/fixoxabadepanixor.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/nnun8hcq4ffuitccgnvjoifcg0/7755890525.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb802872e70---wefuderakedobalegalesi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c32a3a2320ddb9ac37849dc8cdafba6e/vukivazuj.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/28793083738.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a5cd6ed8b---52809890210.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df45b50fa---5287245020.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28a67ea93---bilenujup.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/82637765737.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/68cf2509a4ce43d33c8a15b417990e4e/467633490.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/120506135282.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/04cd4b03004bb383b5aae07499597143/dizofediwemabusavijup.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/nesewotinufaweloxeruje.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0d2f31ee---8816662257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=quality+control+project+examplesPDF 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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16548 bytes
SHA-256: 6ba2a152bbd48de3048b11936d2df6761cddbfebf95d0c17bae7c042861e3681
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 11040 bytes
SHA-256: 76c4d8a7cfa7b3afa1f45264c4c1744bae27a84bc76f63be3f29c0a0a3d2f77f