PDF malware analysis — malicious · 6c2d0c69f871cb24

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 15:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 22f8b009800265477c4f92a51faa672b SHA-1: 2339db94d09d16530e5becf3ea4a870f7ff43b69 SHA-256: 6c2d0c69f871cb2421dac0f9a2011e1c04fd26c6f4571217ff952429edeed389

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload directories, suggesting a link farm designed to host malicious files. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick users into calling a number for a fake support or billing issue, which is a common social engineering tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e3d2d2278f79fce33932d92fe4c52/rifit.pdf In PDF document text
- http://nsdadventist.org/FCKData/file/46795713627.pdfIn PDF document text
- http://waukeganeast1980.com/clients/877304/File/94030400026.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s1sqvjie7rblcv0q0ksad813rs/58533650644.pdfIn PDF document text
- http://recrute.fr/files/files/1188814093.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ep6ht4c8uhftfd6ncacvhfglo5/3544379928.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2f1e28a745ca90a2df20f259755d2b48/suwujosuvigodidisesuza.pdfIn PDF document text
- https://usssecuritate.ro/userfiles/file/49617289828.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbacdd40e4e---6117250984.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7d500555255edb723192dfc9aa7ebd26/57398307386.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7140c8f809bc943946dad01761896c19/kuwetovovul.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae8e8d114---tukalurulal.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/51jinlb4bev1vnj92q83vck7vj/ropirefeduzazusebigosala.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bf7cbf232422ca9ba1e331a8a2416684/99980315669.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/dudejuriwixivok.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/102f91248fbad9749ee098a7e68f8875/jorabugo.pdfIn PDF document text
- http://chanakyaaerospacedefence.com/userfiles/file/8817016155.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/87044062193.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/19627738773.pdfIn PDF document text
- https://harrisitalia.it/uploads/file/xiwesokigaseref.pdfIn PDF document text
- http://maristaslardero.es/userfiles/file/21204748254.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7499d12a04399ae60e28d51bcb9fe669/31094918680.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6862d4bde9---dojuxeju.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc70e2bb0---40581987212.pdfIn PDF document text
- https://delcinfo.ru/img/files/files/fesudesusofij.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nord+stage+ex+88+manualPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5BF	28356 bytes
SHA-256: `a1b901feb5b0279b10e18df2e77d9669419d0d8d45d7bea3fea1a91e77bccc61`
`font_01_sfnt_off00012178.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12178	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001398f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1398F	10884 bytes
SHA-256: `47ca5709532d63bf47f5667f53de9161e764b435dada82b0fb0c0917aeab4abf`

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