PDF malware analysis — malicious · 31f4825d94a17a36

MALICIOUS

PDF

85.8 KB Created: 2021-08-31 22:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7c317271558a92ba9ba430b2f1ae844f SHA-1: 87b34953bb3c3c7c5d777cab0c50296bb7f6dea6 SHA-256: 31f4825d94a17a36073c7112181f497788dfcd111a33a5691b33f33d497e2736

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs and the structure of the PDF strongly suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=flame+test+brick+red PDF link annotation
- http://studioturina.com/userfiles/files/tibagakimemomejofixujaj.pdfIn PDF document text
- http://www.radanhorse.com/resource/files/50867821584.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0d01f59a---gitadofesedadajapokiz.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jn0fh74k970t5vgh8b8277s4id/88638534588.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611289dd686b8---12563791137.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a2dd6f06---88398756402.pdfIn PDF document text
- http://jun-travel.com/userfiles/file/safadap.pdfIn PDF document text
- https://eminencesolutions.in/resources/userfiles/file/21297607700.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac83e11f94---26444772992.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd9b0602---76108313852.pdfIn PDF document text
- http://www.toptehnik.si/images/70265790272.pdfIn PDF document text
- https://at1-turbo-j3t.com/contents/files/60134534759.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d77115ab---59217880257.pdfIn PDF document text
- http://drapikowski.pl/uploaded/fck_files/file/kojedojunededari.pdfIn PDF document text
- https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/182ebe285f32ca2c39466ce4a54a21f1/75887933269.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16110f1031f35e---xifigopozavezedezutuz.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b724e59d1---retemazusen.pdfIn PDF document text
- https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/40240883999.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ncaal6p65cvvfghrcidm6r6ptn/mazifuxu.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee4b23352---37000258193.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d21c540e27---fonepi.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d14ec3cea---tawovesupobebanir.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e602c41582932e6f56e3fc364581c53b/46434800345.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91aa75856---fudixijija.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/sibewelanupunaz.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_off0000ec7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001048c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1048C	17772 bytes
SHA-256: `9ce6689bfbd84b1d4645fa11c97304eba465360bb522c781792cdc28c9b32e50`
`font_02_sfnt_off0001329a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1329A	10516 bytes
SHA-256: `2bf6cb6424b3070bc1d2cc9af6d6df15b132b5b240c271b842bd39e182958880`

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