PDF malware analysis — malicious · 12a3a52abb1ab550

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 3c42b4937e4778d69da9e6a191a7edbf SHA-1: b219b5671548d9f3b8471924b1c9e683acffbcd2 SHA-256: 12a3a52abb1ab550e8b3e472c9f187c03ae843382e66f4eaa61514df0fb605b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9523

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/587m4mug01pm6fk4p9tauntsag/12965984341.pdf In PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cf34f116---bujefemiwe.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4d71a75c467a38ce8f690018367a6a00/sipodixoruwepuweler.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3c651df28172d3c7177a4c319a30f4d7/wosufogasutin.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5080489ace---tixene.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/beronomiburemo.pdfIn PDF document text
- http://altinay-law.com/images/file/rifupokaxunu.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f421eb598---45813577079.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/30148742611.pdfIn PDF document text
- http://kaztelcom.kz/ckfinder/userfiles/files/dowapusotinibajetilo.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cah4npcomel6er7mgb8ac3b8u0/moxesafagux.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/tuzesosawutenefomugagas.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f91015669---xoxiwigilamazogukunu.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6bc2e0988b8b133b68a6c8a9bd04fbbf/5043763690.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087303683d2c---vedokovevifabovugag.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0nf82rjs34u6d9k37upgniqhr5/dalefutoxubowuxovanaju.pdfIn PDF document text
- http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d764256b8a---vujilaloresedumururugego.pdfIn PDF document text
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/293bcf3f87402b2c4dbfae8a07af679d/358847680.pdfIn PDF document text
- http://insfilings.com/skyzone_classic/upload/files/61798238280.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4bb9bb2c573cffd18ce6ac6402414735/mewefogoledij.pdfIn PDF document text
- http://degeninhotel.ru/admin/ckfinder/userfiles/files/zanibumisebute.pdfIn PDF document text
- http://charivne.info/images/file/42579460874.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/80da2e00ec265188a008ec6dde24a81d/1682301437.pdfIn PDF document text
- https://nirmalujjwal.com/public/ckfinder/userfiles/files/99220024325.pdfIn PDF document text
- http://nicolalazzarotto.com/userfiles/files/mabixukugufoz.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/3841533366.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d34ca90120794abf6b903db866c5e31d/xawizekotufakatezad.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ubiety+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000fb1f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xFB1F	23204 bytes
SHA-256: `c4e522bf1175bcd467f9d724bd71a77c1f29df875a7c3ba96a0d0bc3ae8ec9f5`
`font_00_sfnt_off0000cbef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBEF	10220 bytes
SHA-256: `a11082911ad43f8e90342a24aafdee2a85bdbf75540e2f8826ce976fde8345d8`
`font_01_sfnt_off0000e30e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE30E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012432.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12432	16660 bytes
SHA-256: `7a9089a99e5ed99249750c4f0747d42180198ceb81bbe201a23f50650f9da965`
`font_04_sfnt_off00014f77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F77	2600 bytes
SHA-256: `0bb0aea2a1939022551184267131fb6c75d2d73adbefe8aa58bcba5543a23141`

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