Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9b88b511c0a2cb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 00:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc6a2b4935283841862888cb1c7c57b SHA-1: 0d66fab79d9a0529b84700de81ba8fc7629e7919 SHA-256: 5b9b88b511c0a2cb6cd0fc645ccde0e4b31486b1f203ccba28764a5abd597574
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a QR code lure further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=how+to+scan+qr+code+already+on+iphone
    • http://china-engine.net/ckfinder/userfiles/files/tigazajedej.pdf
    • https://xyoaa.org/sites/default/files/files/bulalenevukanilagoko.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/df97fdecf462c5f5605f009b35826aab/39727042304.pdf
    • http://chi-kara.net/Upload/files/88652142192.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/10975861091.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4ae4cb52---zaxolabizefibekajewusa.pdf
    • http://tasfor.com/files/galeria/files/84062708399.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/tapifolar.pdf
    • https://ostrichpharmaceuticals.com/userfiles/file/lezaxezotuniro.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/47615223516.pdf
    • http://zussobrance.sk/grafika/dokumenty/sazepiluvonajivakofelutem.pdf
    • https://samajsutra.com/userfiles/files/xawekivokiridub.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87686920c---94119453036.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e9b44443dc2fd3a02c2fa77257a489d1/7353048987.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/35303273289.pdf
    • http://mylivediamondinventory.com/uploads/files/4926560165.pdf
    • https://wecareprogram.org/images/file/47322955216.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/55577f5dfa64df36b2f6734675b76689/33468415260.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/mijanaribimekilosimipez.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/liwumusutupuxaz.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145f5c6a9734---28326899407.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131ab4226b---dupijopugalawovisoxarofes.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc578ec45---sobamigijub.pdf
    • http://mptech.vn/ckfinder/userfiles/files/38476759632.pdf
    • http://panel2conso.com/userfiles/file/75843780525.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db14.bin
0eb3986d6df5c5c1f96282c4675121d6b71451dccc53730e1e98962a0305c52b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 18064 bytes
font_01_sfnt_off000109c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 16792 bytes
font_02_sfnt_off000121d8.bin
ca7d15030d4a0c636260cd7678a48c42ee57d47afbd4f42c2d1f00b859a18162
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 10948 bytes