Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96131cc8d170cec…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 08:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d8498e8d48f930fc7e2b2581586ba54 SHA-1: 64e8f561f69318fe96f47fcc7d8af9946e8a2ea5 SHA-256: a96131cc8d170cec93d8bb7d777c370e811182f4431a044014a92b793a66da68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely part of a phishing or scam operation, aiming to lure users into malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=most+beautiful+powerful+android+app
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zikunup.pdf
    • https://myreply.mobi/snappshott/editor//file/nukizuwolinazadibixofepo.pdf
    • http://captainkillmite.com/uploads/files/202109050017196691.pdf
    • http://origo.ws/userfiles/file/pimimejitewi.pdf
    • http://dpnovelty.com/upload/files/xukapefu.pdf
    • http://haraj-alqunfudhah.com/userfiles/file/85574440221.pdf
    • http://ty-universe.com/image/files/20210901_164705.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/puvekirobodixo.pdf
    • https://italvaping.com/file/semixizidevimalim.pdf
    • http://intersonik.eu/upload/files/jiwem.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6a76a736e79c2b0c4e690d20bb5b24af/sizijetevuxijikupexokezid.pdf
    • https://xyoaa.org/sites/default/files/files/35779594862.pdf
    • http://gayaarchi.com/userfiles/file/20210910124959.pdf
    • http://www.hgbehringer.de/img/files/files/22716040693.pdf
    • https://behagi.eus/files/galeria/files/xivafekugiv.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614548c750973---52517464904.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/861c3e29a1931c4b36f207efdc11be6a/72868558483.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/retixidoxepuruvunufe.pdf
    • http://kristiankutschera.de/userfiles/file/fizate.pdf
    • https://fuze-pay.com/ckfinder/userfiles/files/kitoxe.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kunanejotogademegonimunax.pdf
    • http://progettogeometra.it/userfiles/files/waxopadogeb.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/rutasibotitakitumusij.pdf
    • http://linkingpeople.info/userfiles/file/42427033309.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_off0000f565.bin
84115864b7deffeaf302c8ebd9431e51e9c27f5cba526b8db4672d431ff0d503		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 19592 bytes
font_01_sfnt_off0001269a.bin
131cf9500a79a58705c3f9cca92a6262445827006eef26df3e1ce0177e19cd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 10812 bytes
font_02_sfnt_off00013f82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 16792 bytes

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