PDF malware analysis — malicious · a436f08cacec9dab

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 15:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a0b815a881147ce0e5bfc287ec9ce852 SHA-1: 3ad8e5b78c049c681a9ce397a559dd0c94b4c46e SHA-256: a436f08cacec9dab36f5d6f09a523dacbce09fe013efc207f75f17980e6c2c75

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-standard, likely malicious, purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://synerhu.ru/uplcv?utm_term=rest+in+peace+tamil+meaning PDF link annotation
- http://gleneaglehoa.org/images/file/74524463676.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/xumejugobavulejuwatolog.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4183e18c2---24566934171.pdfIn PDF document text
- http://thesnowmanicecream.com/ckfinder/userfiles/files/gudazub.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20210517214728.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cede128a3---ronoludimogadozewu.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00a04a973---52916099043.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160afb050e229d---sakakix.pdfIn PDF document text
- http://stellamaris.cz/userfiles/54691042684.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bb8850ef1c8442438fff554b1e4c45f1/duduzupurepageda.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bba71b7163460456797194e0a19fb800/88913870156.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa82dd2d1a---povokonufetetepabuvig.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424dca4f6c---78709633975.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/oii1iiu7i27vef4arifmna9ee7/64249135844.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f607764d2---39918539537.pdfIn PDF document text
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/af46e47f600a4a28d3f23c912dc6b441/26266258240.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7fcb770af---96600126650.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hsl6oo6c1vo28p9i6o1sq2rj9c/45613553831.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n7r4fjka6k1l3mb6j6o1b2ahqi/10548544018.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5k3opjb2o1eep0h4g3vouoki1n/20075009611.pdfIn PDF document text
- https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099b591d57ca---notexesetenuris.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609adaa09b11b---43492255186.pdfIn PDF document text
- http://szentdorottyapatika.hu/files/gavasogaloledimabulu.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3617826e307be62a8dc7fa963a0ecdf0/33314116608.pdfIn PDF document text
- http://e1pl2.nazwa.pl/busy/fotki/file/36669146793.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_off0000f399.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF399	10544 bytes
SHA-256: `3a593081cb0f090a8335756824490c64d9a4ae08a0bd2f58ee962c2fc2ae24be`
`font_01_sfnt_off00010b98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B98	18416 bytes
SHA-256: `71220ce163e9b930d5e9cd6df36d54892ae95014f7113b11d00fb2728f75f6b7`
`font_02_sfnt_off00013b7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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