PDF malware analysis — malicious · fac92076effef6ba

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 08:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 11a5433832865defb9cc58daa901c987 SHA-1: 81e0def31a1a2f9f85da77b169cba7c4e97690ae SHA-256: fac92076effef6baced8d58d004c5da1589d34e567d1d79407379391f2692e6d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs confirm its nature as a malicious link aggregator.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://jancsoalapitvany.hu/ckfinder/userfiles/files/61335016422.pdf In PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/762e09dc30146516c0ed5163e1278c4b/bokosavi.pdfIn PDF document text
- http://massiimo.com/piceditor/file/25679374115.pdfIn PDF document text
- http://factorycontrolprojects.com/userfiles/file/89881252786.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210912_EC6F14335A836F13.pdfIn PDF document text
- https://nhahangthanghuong.com/uploads/files/toxixatagijirivatud.pdfIn PDF document text
- https://optical-axis.com/uploads/files/202109040455043105.pdfIn PDF document text
- https://stalbeckers.nl/userfiles/image/file/21214264335.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c268e87---fobimozomedetewozowov.pdfIn PDF document text
- http://tienphat.vn/imagesflashupload/file/47158901012.pdfIn PDF document text
- https://peoplesmodelinternational.com/ckfinder/userfiles/files/65427539869.pdfIn PDF document text
- http://calisnt.com/uploads/files/75324372130.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/45145082871.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/65239724359.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/27679905fb77386bd90d310a2307ef29/zudejebefo.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e00b55d2---zejibeju.pdfIn PDF document text
- https://snf.styleguides.ch/userfiles/files/97540669115.pdfIn PDF document text
- https://digireg.si/upload/89725809881.pdfIn PDF document text
- http://shengyaweb.com/uploadfile/file/2021090800022782.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7cc1628933f77899c868b57996a501a2/48282760555.pdfIn PDF document text
- http://asqcert.net/files/files/84976895293.pdfIn PDF document text
- http://flapboxes.custompackageboxes.com/userfiles/files/4666165922.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161390938d3a12---tikaputa.pdfIn PDF document text
- https://elperrocallejero.info/ckfinder/files/golilazinasolulabik.pdfIn PDF document text
- http://candientushinko.com/images/file/12429086431.pdfIn PDF document text
- http://longbeach.ilovepokebar.com/uploads/files/detokagutejimuwemigo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=c%2B%2B+without+fearPDF 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_off0000d57f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD57F	10208 bytes
SHA-256: `876b1ac100b4f0d0e7a845d6baf6b185332d14de2199021aa27ec89a9259da5c`
`font_01_sfnt_off0000eca5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECA5	18028 bytes
SHA-256: `cf61a779772e5d438f7ab3d9def35f141048148a7b75ae04927e24d48ce77620`
`font_02_sfnt_off00011bb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BB9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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