PDF malware analysis — malicious · d1757b11ba90a3f8

MALICIOUS

PDF

93.1 KB Created: 2021-07-16 02:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d4c29c4b73fdb0b9f0701b13e2e7e274 SHA-1: e13a951f56d5e6f7dd03bdbc760c35382c640102 SHA-256: d1757b11ba90a3f877900b96aececeaeb2691fc78e2543dfd9671df3de422aed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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://avenue102.com/uploads/file/28932055282.pdf In PDF document text
- http://lotusromeo.fr/app/webroot/files/userfiles/files/94688344229.pdfIn PDF document text
- http://dochoiotovn.com/uploads/userfiles/file/fineninawajunejos.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ea6dd34e4b0a1cddea5d76825e7dc7f4/78198720447.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8f823f7e73dff1034142ea058798dee8/82864103468.pdfIn PDF document text
- https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1abf48dbf7dd3776e4e31d8120df9aa1/mekur.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/21527027702.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d5afa5a74024123342c18c4f1bab87e8/lapaxurolodujifeninuriwu.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2160643fe8---gusojukizepeza.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/momojija.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565de62322---38061556929.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c14c2b49432ea6ac9e261ab69e697290/sujopojuzoxadozo.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096da7ea112b---87438450134.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6d7b53628afcd853d8eacf2ca56fc9d9/kufinibizepafokepefo.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756901e0863---benumirenos.pdfIn PDF document text
- https://kiaavcilar.com/upload/ckfinder/files/jinojutebab.pdfIn PDF document text
- https://zanhotel.ro/beficientconsultingFiles/file/retidosixiximilil.pdfIn PDF document text
- http://brooklynsmokeshops.com/admin/images/file/defazamekijumafolunodes.pdfIn PDF document text
- http://kotolantopeni.cz/file/kofinatozawufusupoles.pdfIn PDF document text
- http://janandpoos.com/clients/872640/File/fuvufejuv.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233102c4c0---33135818623.pdfIn PDF document text
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/15ac17ba600460ce75ff9b7d474328d4/74009457742.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/28851375433.pdfIn PDF document text
- http://crisismobile.com/ckfinder/userfiles/files/34365660287.pdfIn PDF document text
- http://westernstudioservice.com/admin/userfiles/file/96495026786.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gmat+review+12th+edition+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d6cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6CF	10912 bytes
SHA-256: `6a57cf6b1f17f0ce9bd783a90f418547afdffbc0c3b072483a439ef7ad15ab58`
`font_01_sfnt_off0000f007.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF007	18300 bytes
SHA-256: `a645bb4876e5a37aad7abc726ba8548b6f7302745ecc2cfe54c6b3b3259029c8`
`font_02_sfnt_off00011f40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F40	14736 bytes
SHA-256: `90412b6ed41089ed52ae35fba417e00ccdfdaca75419946ac092c87311462646`
`font_03_sfnt_off00014c1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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