Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1156dbc1e552212…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 01:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b69c7bb5550c6c9f32d86d632c3fa513 SHA-1: a817da22129d081e30a7eff9368a9f32f66047a3 SHA-256: d1156dbc1e55221250d407f171e518c13d3f34c5d25f1cfea37dbeeed830bef6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress upload directories. The embedded URLs suggest the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=uwp+pdf+library+free PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc363807e---norupog.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/lowezebiduvaterunimenisiv.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe90518d93598b1a5049d47eab3fa4dc/38301963801.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/52155613349.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-13/20210813124610619042.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/9648290958.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c46fa877e---61535479977.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7a656bd613c535374ddb9bcdec91b0d4/77044599510.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/74307031342.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/95187138129.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/67562605414.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160720efb6688e---vovetawilijepo.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/dugivotusadebeso.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/gisegutoxafewomipu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/naxugodikixudazuzejanu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/139403244260cec7d296bb6.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2ae52941---palibabijijobono.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/tigamijofudafawalow.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b336ccafb42179168b97a6a3aeea4e79/25621547737.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/10022755196.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/6492248241.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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 10348 bytes
SHA-256: 4e1685392f7efa48846888641046d5396f948eb5245271ee4f368e0a0a85c10a
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 16348 bytes
SHA-256: f4d98953046fc87b94c5646a85f9c0f72adba810a6df48c4516f36093b10d51f

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