PDF malware analysis — malicious · 72b9038b83a4bd5b

MALICIOUS

PDF

81.8 KB Created: 2021-07-04 01:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 7db5226a8d4435ccdd2aedfb26ff4def SHA-1: dcd869bbcb26904bc7d32809c67e7ed002a49f36 SHA-256: 72b9038b83a4bd5b915bea6c848039d022e95e10115524ee0e97d18e5636aee0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=420+ft+lb+to+nm PDF link annotation
- http://aihyang.com/userfiles/file/52164975190.pdfIn PDF document text
- https://unserbiokorb.ch/userfiles/file/semenubifoxe.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9461830a---8161729928.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39aa2686d---tasejijazatolawazoferape.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210702115603_2124874046.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/310567767985dfecffe5847070a60a0d/83925342221.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8fbdec26---48743142754.pdfIn PDF document text
- https://barcelonacentremedic.cat/files/galeria/files/xenuzedalesof.pdfIn PDF document text
- http://creaorganization.com/depo/sayfaresim/file/25485085522.pdfIn PDF document text
- http://drjoecarver.com/clients/49355/File/kibudaporugexetanar.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fd38f8fd---90945744034.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/83003447217.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1146b6fe---gixuginomawabu.pdfIn PDF document text
- http://abogarestudio.com/userfiles/file/22523547257.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22f830a2c---53735218505.pdfIn PDF document text
- https://optimustelecoms.com/ckfinder/userfiles/files/vemozumafit.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9de9890d---59365878253.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b2796ce43ea4c5bd4709aa2d66dfd967/19605277026.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef7919a4f---jonofituradejoz.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ce9f3f0e1787f3fe725026b73cfbcddb/vesuno.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/71376999060bc481863331.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8d053b7028dc786a1c04b7643f2e961f/xikivawi.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a237ecacb8fe5a524e6001d0edb8f6d7/xulix.pdfIn PDF document text
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6f72df5a1834099e43b07ceb47aaa10a/ninewadomimitolo.pdfIn PDF document text
- 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_off0000dd54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD54	10084 bytes
SHA-256: `8e139514f8c0444701445a9d47ac298002173c79dea7610d9d14f51ed804ff1d`
`font_01_sfnt_off0000f3be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3BE	17716 bytes
SHA-256: `99a89c10518a3442d3e743c193ad328e6007847047af02f40c0059a5f83a0a51`
`font_02_sfnt_off00012218.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12218	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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