Malicious PDF — malware analysis report

Static analysis result for SHA-256 071d8ff47d17095e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cca4d5afdf054278901f1334a936271d SHA-1: 34d55db84871c31f16080d132322b2f91c5cce39 SHA-256: 071d8ff47d17095ee39320b079be8ede310a0259ec4cedcbbdb660744ecd5f87
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites hosted on compromised WordPress installations and other disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=bizerba+gsp+hd33+manual PDF link annotation
    • https://ahl2005.com/ckfinder/userfiles/files/sorudazinubirinevis.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/xajupukokurikisaninef.pdfIn PDF document text
    • https://jurad.eu/files/file/67246214798.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/putekuzavalunopirinujixi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/52093709069.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f0940d155fe4508d32294421cd1d42f/51235163338.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/73454394063.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba953268b---futexav.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16111059ac6151---tajiduzit.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sonipijidoz.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beacc9a7804---nowinulefu.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/61705150329.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/38059269264.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c3f86458a540f835d8708ce827330f25/17388551443.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/latawatugujakafubixexaw.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/4686446830.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a335a7acd7b---devixago.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/dubomibimapekafaseworupo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/11931369759.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/63534349729.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/abb0e46ec20af02bf9ff0379fca20dcd/rijomoj.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161107c2fa0be7---tokudugupusuzuxil.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/s3fbdmkae3rn7svbgq3psdgqet/69315932873.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/18096745829.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/80403817364.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/52114116089.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_off0000c00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 19148 bytes
SHA-256: e8bc0b2d3e6b4e0d847175a91f04997e59fbc12ebe6ab82c46c8f142561dad66
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11144 bytes
SHA-256: 2a470be34f79808b6c46548b6dc36fb924e1e37bcd15a11679346eb5293e528a
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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