PDF malware analysis — malicious · 2c39a8299fcac2e3

MALICIOUS

PDF

93.8 KB Created: 2021-08-17 17:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: da93b4e2da651878955e22ebb811d0ba SHA-1: 2648f8aadbc2722317565a6e4a976965feef2adb SHA-256: 2c39a8299fcac2e396f5ee898777b39b618b23a6208b29faa721c1c7070a2421

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2450f98e---31927692143.pdf In PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q1jb32o6svsfers8cp23jb3ksf/14593916000.pdfIn PDF document text
- https://karapinler.com/calisma2/files/uploads/selovagirav.pdfIn PDF document text
- http://stpatricksreunion.org/clients/84553/File/38166556724.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/744656c0ef7bc0f9cf538c3f31d77775/7234604400.pdfIn PDF document text
- http://0930actress.com/files/files/dotupogawawetikematamar.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a437c2a09eb96349137b7e93cbd8a887/zadoloxulesotuwugibadop.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/gizetesiposurenazokema.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bac562b1---tofudiviwusifewuxabeturos.pdfIn PDF document text
- http://www.mustwalge.ee/data/content/files/53797996796.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e3jbh2mamnnb9kns1ekc51r052/wamujedukovojo.pdfIn PDF document text
- http://csc-021.com/userfiles/file/20210811043435_1m6n9f.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7f82081a---jovuguxijutafodug.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4b5d3b4fad075a8b1a44378e1508201e/24402517021.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7da0331bc---81450988706.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e669bdde---zilezisixit.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/77df5d4f0bb95ca1e9fbd92a2e530b43/47592287027.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d8399244---xusiterezudixosafor.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9011789c98---44108558798.pdfIn PDF document text
- http://studioscoponi.eu/userfiles/files/13925258168.pdfIn PDF document text
- https://majubesar.net/contents//files/29264449616.pdfIn PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6b5ee19---73580233903.pdfIn PDF document text
- http://websurin.net/UserFiles/File/memup.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9aso1f7g9r1196a0e5r641g8q2/31534619389.pdfIn PDF document text
- https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160775c8e4b832---79700117090.pdfIn PDF document text
- http://shethof.ch/cgi-bin/dynamisch/file/bojonimopobuwerezesebuwi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=buku+panduan+manasik+haji+dan+umrah+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
`stream_003_off0000e517.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE517	20624 bytes
SHA-256: `cc48906da7de247339b26412c40266d1c319b499200133f04545f5c977c9e126`
`font_01_sfnt_off00010896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10896	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000120a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120A8	17652 bytes
SHA-256: `93746d7032bc56cb07f085d58cc81c5e481514f82ce4b4bc3539757f35c944f5`
`font_03_sfnt_off00014e89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E89	10744 bytes
SHA-256: `65683a6e35e5e88aa0a9b40540ab24af3e5ea1ef2e77f549e140d8b3d4fa3f78`

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