Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb94524fbd88878…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 22:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0604cd147261a7b80ad59988006f1c6d SHA-1: c9ca564ad50c8946d053d770005c4a61d075ebd9 SHA-256: cbb94524fbd88878dc5c6a4cdfbadd8cd78be72d81b16d2f39a5217807f602f7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure itself is identified as a link farm designed to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=radial+nerve+arm+pain PDF link annotation
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d8a26ec6a780ecedfe119ae9cf846ff5/zixof.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/fivakunuwemizeve.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suvonujiwevinewotiki.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/87542302705.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5716a40c5---puwidajejapitonoto.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mojufinetakudote.pdfIn PDF document text
    • https://dm288.com/slicice/file/60915860048.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/19000021733.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad95dc65e---93963429074.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/21496530127.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/9861501428.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/niwamijinipuvapibes.pdfIn PDF document text
    • http://ippon.lv/uploads/File/30147523075.pdfIn PDF document text
    • http://rayer.cn/d/files/tuvanafakatebenu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e7476369b98e8d088eac55f9a3e487e/33294991335.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zosalexalabafe.pdfIn PDF document text
    • http://elitacasa.it/images/file/jugatusanozi.pdfIn PDF document text
    • https://andana.us/files/files/suzaxon.pdfIn PDF document text
    • http://zimmerei-possert.at/jexufopulotupewelano.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109252122124901.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/27944368792.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/deladasetesaxenasudujo.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/54921023930.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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90A 10276 bytes
SHA-256: d548937918a6ec5d2e9dc7ee76e2e4a7676a14927e02aec5b3df571c087b1805
font_02_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 14628 bytes
SHA-256: c90783a81b31cc10d73cedf269934c769289a169d227357818b4d2df6d8945a5