PDF malware analysis — malicious · eda1f01fc2f2f56f

MALICIOUS

PDF

94.4 KB Created: 2021-07-02 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: a41b410d1062f49130c6c2d8b33af72b SHA-1: 0998dc79ed521ab73cf8ee3456988883e51f3373 SHA-256: eda1f01fc2f2f56f1c55601f511a5c6d8413978754c77e4655bf78146b7dc8bd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malware or phishing content. The PDF itself does not contain readable text, but its structure and embedded links are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5e56fe725384232ea405f1de7e8128d8/mipagawobijatipuloge.pdf In PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2isdilo00ii88tivsq2uut3vl/76216204259.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ab7dac01---1121481742.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mojlnr7k94hutqkht0s1c5uqvq/80889509683.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40a30j9tp8i8i5ep6qqgkhj120/19870196819.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/mugafazuvaberivorukaxepu.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effea2bc3c---suziwowijuzepojidipada.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/04c304a357616fa6e73d1f6c474431c5/69164073313.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608719a753d30---dupewibadotapigogesuj.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fd1cf5fabd412c4088e6dd6870c935b/64056904032.pdfIn PDF document text
- http://kuzfarm.ru/images/file/92184116974.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/6756995735.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e2c9ee6d13fc8adfe0b410ca6012c88/tunotejopilegivogonu.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/56225775970.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c799c47196---9316203047.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69840773e---29271912615.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a44310e---feguju.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813a24a7c37---77889283662.pdfIn PDF document text
- https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/aopmhpvfo3h0tcvt7hjik1ie16/mujizekobulaw.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p3fvrfujmp34id6jj4es4rrggi/57071826323.pdfIn PDF document text
- http://aps-mes.com/files/file/bepiwuwem.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j0ifc3tjeu565rnbo8n76tbn5l/25706049298.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e0a100cc---wigeziwu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=110+kg+to+lbsPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f840.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF840	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011052.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11052	18092 bytes
SHA-256: `f728aa66508c06621e8761d54d8dbf178f42712ac87fdd15fd6842235fba9888`
`font_02_sfnt_off00014057.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14057	16192 bytes
SHA-256: `f7b9253987216832ec511a3c7ffdd777d8ae21bfd21e5a9c2e014f7e310ea55e`
`font_03_sfnt_off0001560e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1560E	10000 bytes
SHA-256: `419a833d72309c0123bc41ef734658157a745bbadd4a8ec22f1f5d890e19ce42`

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