PDF malware analysis — malicious · 8bd36e4cd7a71100

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 16:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8d34bab906dc99bd99c7e406bf1e6b0c SHA-1: 7cb0d37e43532acb3bcbc94c5679d33f82bbda6b SHA-256: 8bd36e4cd7a7110000b57f21dd110e82319b9ffd12ed71f49bb3d612b9a01a2a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the nature of the hosting point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94a66ce80---lejesaxisol.pdf In PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2ghcg0scelcfp0ao4fq04qqme0/lifomolupotokoreko.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2696bbcae2f0bcbbdefbd3d1c43ec3ee/88027084675.pdfIn PDF document text
- http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/62351607673.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/22b9bca2c3048f2d0ea5a3612dc050cd/vemotu.pdfIn PDF document text
- http://roosprommenschenckelfoundation.nl/userfiles/file/59809301018.pdfIn PDF document text
- http://centrons.com/uploaded/file/72115002361318c2a2306b.pdfIn PDF document text
- http://soldearenales.com/galeria/files/ditoromewofuwigemow.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bec3e89e10c22a6385d973d0c64ff971/jikazixugo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31daed84ab---5475344600.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c995f1a08e0---funexekisuvelazimatiwalaj.pdfIn PDF document text
- https://bikeid.net/ckfinder/userfiles/files/1116260968.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/ruverovotatalu.pdfIn PDF document text
- http://xaydungphongphu.com/uploads/files/jezoxumefujumamim.pdfIn PDF document text
- http://ferrogep99.hu/static/media/file/ziwegamovujixi.pdfIn PDF document text
- https://sabunwangi.com/contents/files/mojuke.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b5c21fce---98699413943.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3e941cb3---37524961034.pdfIn PDF document text
- http://evolutionchonburi.com/userfiles/files/duwapabag.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9975a9ac1---4380814170.pdfIn PDF document text
- https://etonbio.com/newsLetters/images/file/xukumafapibevetufesipolij.pdfIn PDF document text
- http://belean.pl/userfiles/file/sitazivap.pdfIn PDF document text
- https://matharu.ae/userfiles/file/71262722470.pdfIn PDF document text
- http://unternehmensberatung-hegenbarth.de/userfiles/file/25013773078.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d20ecaf9e---pemexawumelipege.pdfIn PDF document text
- http://preserveproperties.com/userfiles/files/siwamonasulikokatotorunu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gesell%27s+maturation+theory+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD868	11052 bytes
SHA-256: `c3776555675ee8c96231b1c7e84cb8ced12a9ccda469bd8aef1bbf750ecb69bf`
`font_01_sfnt_off0000f1f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1F6	18104 bytes
SHA-256: `48a2f6cbadebe648ed71768b09336a1f0d60325717c2767623b379dd1bc60f20`
`font_02_sfnt_off000120d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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