Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b89bad12d4dbe61…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 00:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7569a97d7315b0c678b7ab2c1ac80b8 SHA-1: df230b27ddbe405a4cce9e318817579df683a74d SHA-256: 1b89bad12d4dbe618c8d80cf1a3ba8f11eccd964277c651b8add07b408edc1c9
156 Risk Score

Malware Insights

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

This PDF sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b31f4b4c97543bb078c7d632b2c1ddb7/48529344938.pdf In PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/37308026375.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4fcc962799add9a9a1f0e44bc7f6f257/9342928367.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/l87hnofe1ue8fovoo3n7elmfn7/dasedopawilusiwejupe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728ab47bbb3---kutegawe.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/26980231530.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/44225291422.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/fakodunuwigozoro.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/mopoxojenofelivinowuved.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/gunezixutenareda.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/furdqmplctvhi58n5u1c32a80r/79537349999.pdfIn PDF document text
    • http://usagimatur.com/files/others/nofojebona.pdfIn PDF document text
    • http://schubert-hh.de/image/file/pubem.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/14656677016.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gidogiwubo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088019b0d99e---poromakimefesir.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wutubidovo.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/kavizajitobuji.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5863d823da---20062226778.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52fca68f9079d8eb9093a9f67bcfb863/35587498425.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/1519685198.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/qjgh0nroiosqgosubjat8pevl1/15423879880.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087f29d97931---zimewof.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/7688203888.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/33778519612.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fbvtsc2de37pc4ic6pbfkqbg4a/wizamelevuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=365+bible+versesPDF 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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 10200 bytes
SHA-256: a07d6cb1f91b02657da461bfb357d082d1e7f64d977a1205345f9e7224eea65d
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 17480 bytes
SHA-256: 95e4fda2bc1054b5c789706a8907a48a164d76f7f5e76bcc86442d25d829f88c