Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a33619b4f835dde…

MALICIOUS

PDF

74.8 KB Created: 2021-08-15 20:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a7d0e0be6e1dcb248708c9373240721 SHA-1: 5bcbb545849a3179ba8c84f114cb2a890e197cb2 SHA-256: 0a33619b4f835ddea60e10d00919debc307b6d3526ce65a42ffb5178e3350a02
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://smidgel.ru/uplcv?utm_term=old+town+road+vs+ramta+jogi+mp3+download+mr+jatt PDF link annotation
    • https://office-agglo-larochelle.fr/userfiles/file/95878145437.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/tiganujima.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609029f267e57---lapuj.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/50096669984.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1627431117.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/pikof.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/238fbd6ba25eb4f79ebf97d6aa5e6bb0/zagerabatofevaj.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0935e6731138e09bb037fa442880f59f/9214993813.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16117f87c349e4---35137366488.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/48863618279.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/samuw.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d0c86dcb---58658416213.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hlinqjn1jvqk392eh8tue0pk6i/venopep.pdfIn PDF document text
    • https://tessuno.com/upload/files/60fb2c2879a96.pdfIn PDF document text
    • https://aneri12.cz/res/file/67823196528.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/4c76166507f68301765902a7928877e6/jixijorukumubig.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/51eb8d90e2508e4e5cc697972d73784b/nowosodipipuxiwekusojad.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/1337497318.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/18893674030.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/v5tfg7qetl0d6u7iktu627rvif/3141412232.pdfIn PDF document text
    • https://corghialberti.it/file/migosokakubusonofados.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/suvewanoditoxusaz.pdfIn PDF document text
    • 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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 16596 bytes
SHA-256: c109cdbc787c0dab395a18ea6ecca8c2871f03343723c6ca2d2309b110faa603
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 11080 bytes
SHA-256: 965ca2b67e659040e3e355013fe96667040aec12ee45d499676dc6e72eb67b78

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