PDF malware analysis — malicious · a395c2401d1e6134

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 21:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7bbba02bef73d1cda59f214e705fac4b SHA-1: c7e4e4042c63b88a14ff475deece5e6eb5e7e5cb SHA-256: a395c2401d1e61341264f0cb803f363756fb8f2695cf5be516489e42a47108c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links are designed to redirect users to potentially malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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 http://ceroki.com/image/files/vozewalanilitebufafunose.pdf In PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/37jfmc4crjlkoh8ohrhlrdtc04/wewukujotima.pdfIn PDF document text
- http://aptchasers.com/FCKeditor/userfiles/file/48060526480.pdfIn PDF document text
- http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210623224339.pdfIn PDF document text
- http://wurbs-hanau.de/userfiles/file/36937532218.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ee1625e6b828610b94436dd7ce388d2a/60566109431.pdfIn PDF document text
- https://desense.eu/uploads/wysiwyg/files/75045157168.pdfIn PDF document text
- https://keralatemples.info/ckfinder/userfiles/files/vexipisifilikarit.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11e557e36c---tomulatapilopek.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c305dde4cc538b91d2311e36e6b4340e/61980520047.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbf4643e8---3612954131.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609adee349f02---gezojizumenoka.pdfIn PDF document text
- https://areicon.com/images/file/29185067294.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/dc744dc82e881b8149c0f4896b9410dc/1017692492.pdfIn PDF document text
- https://alsultantrading.ae/userfiles/files/71624382723.pdfIn PDF document text
- http://onlinetalk.jp/app/webroot/img/fckfiles/file/lejikav.pdfIn PDF document text
- https://bruceautoservice.com/files/file/12480505163.pdfIn PDF document text
- http://kuresi-kaitori.com/upload/content_pic/files/43544879839.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/75262890989.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609780529c9c5---8112544253.pdfIn PDF document text
- http://hitecds.com/userfiles/file/94923266456.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1feb08ae0003628c31ac01fc94b591ea/fozagilijimes.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/72503724344.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcbfaf36eb---wobikegikejodo.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a676a98229---10562610315.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8cd3c7c30---27320388284.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef8031f80d2aafc506affc1c5d233fb7/likezuge.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/96058135816.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dale+tiffany+lamp+shade+replacementsPDF 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_off0000e233.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE233	10880 bytes
SHA-256: `c73b9d59eed196f29665398c307876e1c1d2a3c1d63a39d05a3cbcda18fd905b`
`font_01_sfnt_off0000fb2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001133d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1133D	17068 bytes
SHA-256: `140cda8f06864df06f6a0e0f447cf0d5518e209033e191904756cd4d86c37095`

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