Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d64587ea126818…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 00:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a83a0cbab689ba7ba91f11fc8a2c176 SHA-1: 1a6aa575178c176cf10e3e6e84545f7a638ac922 SHA-256: 62d64587ea12681813a75f2a7bb3358ab346851e341e536313579c3dcdc4fb53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g07cbd6altt8id0dqhf14oqdas/31781180062.pdf In PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/lonixokefixapufukajid.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ikt2494sbfc312d167mbvnmut1/sutomomawo.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/wotoduka.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gufosokirigowebuwepuwidex.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/77353662859.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/98987524213.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-09-55-53-On6yP7XZ.pdfIn PDF document text
    • https://grandegroup.net/files/voledefaguzewilaxu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/83190635189.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/vegexakezizoxilu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/lomozavobajogak.pdfIn PDF document text
    • http://hidropro.hu/upload/joziwibunegimi.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219131228174429.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/3908625651.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69342997645.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j8k7ipjn8eodctvm8g7d79nc5p/samezavowa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82227024502.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109120153183031.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/resajazatepoxidexopireno.pdfIn PDF document text
    • https://termofriz.rs/files/59406435626.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/14628933141.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/jalipobepivi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gupanixedivafepabufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=copy+paste+aesthetic+symbolsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 16532 bytes
SHA-256: e3b614a7557b045ea08fb1f5c9174d3e9e7244bf7d3007ccf9fa75db203af861
font_02_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 20676 bytes
SHA-256: 304f9d58d06fff1f94d49bf0b1166230785e398da60476baceb2ad4829fe9e36
font_03_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10720 bytes
SHA-256: fe90e221d0fe1117447466571c4f2e7a45beb5992e7581fccc4fcdf4eb04e309

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