PDF malware analysis — malicious · 3dd28c7ef5f31880

MALICIOUS

PDF

80.1 KB Created: 2021-07-01 22:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 64deafd408edf6cbc06bf5e2a45bcd4f SHA-1: e9a0f8123030659394232d34c37c1703e1635252 SHA-256: 3dd28c7ef5f31880f6fb56038aa5abc5f134d76dc053dcbf1d9fa7e2d93ba743

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://smidgel.ru/uplcv?utm_term=examples+of+true+bugs PDF link annotation
- http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/99724541510.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/01480c5fa744c2951e0f38b1402dd84f/panuzana.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/abb37b67c75d326924220de72a43453c/genexafej.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071748844dd2---lukowisukemafavipuga.pdfIn PDF document text
- https://purefeeling8.com/data/file/padumum.pdfIn PDF document text
- https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/76020765031a228fe629c2afa995c506/guwijojegegovud.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bfd62ab4a---pozumasapezajanedur.pdfIn PDF document text
- http://decamiones.com/userfiles/file/kilalesamapogopazuve.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f566e3dd---42939096089.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7044ef254---kuvaweselikarekozefoni.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cedcba8c2---45904424942.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8750ae4a6cc3f5010aeff49f9c88b814/xejilelasora.pdfIn PDF document text
- http://eyupsifalibitkiler.com/resimler/files/wusepevuvulerixof.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/22578730353.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/342ui8qjis1peshm12s7dlhd75/fewajumeza.pdfIn PDF document text
- http://xn--dlek-5qa.com/admin/UserFiles/file/94737623871.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fda03376---ladogiroka.pdfIn PDF document text
- https://charterfori.ir/basefile/charterforiir/files/5324148268.pdfIn PDF document text
- http://blow-w124.com/js/upload/files/dinefu.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1451940bb8---befugovafosud.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5a017e94---93253399469.pdfIn PDF document text
- https://whitesal.com/data/images/file/5808_20210609202906.pdfIn PDF document text
- http://scoutpate.com/userfiles/file/68011835422.pdfIn PDF document text
- http://summithigh75.com/clients/867147/File/pisixesavefumeselozam.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/57359057508.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe03c1e3---lozawajonifof.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_off0000d511.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD511	16856 bytes
SHA-256: `7ac311627d205fe3d08e53a960374bee804feba879c619484b4578dacdcaa89b`
`font_01_sfnt_off000100e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100E9	10828 bytes
SHA-256: `593f37367062e608213c4613ef3fffa798a5a6f9c24421d5bcd0f027fa671c5a`
`font_02_sfnt_off000119c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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