Malicious PDF — malware analysis report

Static analysis result for SHA-256 978dfe312811ec52…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 10:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65c2e7f2dd075d42e505e9d29dc83bb0 SHA-1: fa610d64d0f98fc7a4adcfebe69ff30ab94378f7 SHA-256: 978dfe312811ec52f43facf38a89b87bd03ea1fe5f0690824f3d1bc13f810cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO poisoning or to distribute malware through compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dobre-jaja.com/Upload/file/19773443474.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b4ce1f524d789293908d55fb119afbe4/wamemeraforu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f142f528f6---mulune.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f3611b47---jokutukikipetoxazusopedib.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/64997582137.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c880a5a4704---24556246747.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/posup.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/01c439f8c0f208c4ceb3799ff3719213/solixotarogamiposuv.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/sexat.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kl13rok4v9evfvjpkvfutl1bv6/23932279591.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3606c35eca---38710240247.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/pinedegazat.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gojiwatitawurifigunosipol.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117a09d924af---28522078141.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086402b1cfdd---zovakitamiben.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/todunimewuwu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3f6c3c405d924eac30fac0bd6af13aae/4424477221.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/40850849011.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nokudumuzudo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/49139743067.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fipirerubif.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wavebikegijapagobanavej.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0be61547032b2e2b9f410e3c6066d8a3/wonaxexoxagesokozufun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solving+literal+equations+worksheet+algebra+1PDF 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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 15376 bytes
SHA-256: 6d46eb672caa5ccdc9addf57971b58c8ebba6fd554430cfb7145df1065fa9495
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 11144 bytes
SHA-256: de4e7024e1f3eb22720e6d1f19bf167c76828cf5fb751402567cc9fee6c02047

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