Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a83ac23801c7d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 04:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6742dfa1ab0d694858568de227441f04 SHA-1: b79079e5e8ab724d2e512c58aef434ae699153eb SHA-256: 888a83ac23801c7d205a991793e68f00abe3c515695a6a13333212faa62acc48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, strongly suggests a phishing or redirection campaign. The ML classifier and ClamAV detection further support the malicious nature of this PDF. The embedded JavaScript likely serves to obfuscate the malicious intent or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://akinmedical.com/uploads/file/kizim.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/37463986773.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/pndbhsomaq92opr0rau41kujb2/nikajogokevenoribivujokuz.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/1dd6fd3b644817dee046c138e3e97521/43759016487.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c5a6d1f0172964e70949e324a5d1bfd3/kefegevijawuferapegatufoz.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/92034883698.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25672604448.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da4f40467cf2b1006d3eb54501e2ba59/fufovuwapagigasawibabudu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tekupoxugekabexuvasiwed.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/68500824214.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fuzokuluzozep.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/timutukupezobu.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/weroka.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f75e58a46c9---12633106404.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/95957035353.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29a03b511---83765056320.pdfIn PDF document text
    • http://headrepublic.pl/images/files/98653638887.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075377fea98a---85541505315.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6105f02b---mivunabigibu.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/37419501065.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pufq2nhstvbunjgeq40m3onlu9/36895815710.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/maxubakipijesi.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/rexowet.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/70ea50687f66144f2798556034690315/62424661177.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/duturarumefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=workforce+development+strategy+pdfPDF 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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 11136 bytes
SHA-256: 2273fe9df41e120a336601f956b34fceb113570331daaaa25296014c0f4f017c
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 17236 bytes
SHA-256: 7f812ff35951df9b425e5585b6a6b38510ddcbf791caa81890629e89f41f6ab1
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1