Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe9000cb94a7519…

MALICIOUS

PDF

89.6 KB Created: 2021-08-14 08:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88de60f6ff96072d75c774ebb44f600f SHA-1: ab346808c50b6a35b414f51d8df0a47824d1566a SHA-256: 4fe9000cb94a75196f403f6f0dc472bd1e003705e8d6b6f7652ab4d2944b86a7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other hosting, likely to redirect users to malicious content or downloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms its nature as a deceptive link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/020addc006c432b3fbec95e7a99b80de/vibubesusigodasurebupa.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce876f50c4e---jujopafogojuroxurulupu.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zofuvamelunakokawidese.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/40547172556.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fipanafujoruluwer.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/01e4e3a91152f468ea18a96d9beb2923/98640383448.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/47966274696.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210619055556.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b6a5da8b---87748027908.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43584269358.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dalidemefomonogezasit.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd7537f33d---tetofixavifewowovi.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/42746878455.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d146449f0---42614642156.pdfIn PDF document text
    • http://greenld.com/userfiles/wabewesofopo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a213b89667---56317423308.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/95663614363.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/751e87ada255f9dd87206da4d3986781/69480944759.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/ropikug.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/fofesudikubu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/pivoguxivilibi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fdb614e571c9dda7e25852b630637a89/70185966821.pdfIn PDF document text
    • http://temple.mo/userfiles/file/43609182525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jeepers+creepers+2+tamil+dubbed+movie+download+isaidubPDF 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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17616 bytes
SHA-256: b9cefcfb4bdd7a1d551596f6b4360fd0f9ea48edb7488eae3c6fe77b49eaf8bf
font_01_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E84 11176 bytes
SHA-256: 0deb7eb47405e5b76ab7706883899d4b84bcd653291abee27f67c83960a2e71d

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