Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82ba783faaae659…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 21:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e2a8e462598ce61f01ef3fbc502a5ef SHA-1: 852c526c9b48a4a4d0fe9f4b170ccde137ca59cf SHA-256: b82ba783faaae659ed82157168787718e2e0d9cb235f04fafb737ba3fcde3377
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yauspeshen.com/ckfinder/userfiles/files/kefogidituz.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/81400983210.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/vunomatopadizoximek.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/31825730597.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210918_132039.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30649361281.pdfPDF link annotation
    • https://peperita.it/writable/public/userfiles/file/puduxinejefefojovi.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vigaje.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/44335619445.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/2246603721.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210916000134.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/rezoxovigewi.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/80154786085.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/61707894069.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/1935129209.pdfIn PDF document text
    • http://htwy.com/upload/file/43086607584.pdfIn PDF document text
    • https://datenglagi.com/contents/files/luporaxapufagexedawalor.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f28a2f4a48ffa2da2b5040c99987cc38/befidopolexisuwuwid.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/rofokelilobipogatetowured.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gafomafogu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bl6815kagg1ofbogo7jgtp76g0/basipomigupux.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613591c63617b---jusufus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=why+do+my+apps+keep+closing+on+my+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/bedazajubosuw.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 11060 bytes
SHA-256: 859ba654d8f78f52d5bb6ed01bdb702086c22022054e9b7727f7069093fa9f42
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 17340 bytes
SHA-256: bba5433d507de43d2a7c788cc299e601e2a813198a5e9b88815ad4753c95227d

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