Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615d7fd86f40746…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 07:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b20cf1c0a83e8a41250cf762d73b6c3 SHA-1: e5a5e7ecd127f2170f0cb28f36157b9374ac7407 SHA-256: 8615d7fd86f407463acb7f8a343589bfcc0e88c4b8bbaab4126b2235f2d4cb84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary goal seems to be redirecting users to external sites, potentially for phishing or to download further malicious content. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://essaidafm.com/uploads/FCK_files/file/71433472595.pdf In PDF document text
    • http://rem-proekt.com/f/file/keguwi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/usr1kc7s9kj0pk0sacvppi4ms7/43626049841.pdfIn PDF document text
    • http://fourfoods.com/images/files/rudezomexev.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b135cbb0---98881837387.pdfIn PDF document text
    • https://kueapem.com/contents/files/88229439782.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/86666140375.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/redejerud.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/kivorezokewuxagu.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/litemixowimuxameladade.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/vakawimuzituni.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e794b278807143ea3549e0d5eae4a495/42576343777.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/fajutafugavepapumerev.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/22280507949.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/nunimumiwilubawilefakel.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/mivivor.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/93402022913.pdfIn PDF document text
    • http://akademibt.com/resimler/files/majixapujilituneserixa.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/58356394987.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/jovawopulaniralakil.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8s87k9vdp9p69nijp9dphct5q8/37494579787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nico+free+fire+appPDF 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_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 10032 bytes
SHA-256: ee2992bc7dfac3e58bc7c33f876016e97e8ad13972c0544ac74f0308e2de264b
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 18976 bytes
SHA-256: c91ea28e53d0c93ef19b12bf0dbaf1e0185a89830d4818eb615bd362f1794a6d