PDF malware analysis — malicious · 82e699d3aaa4d0ad

MALICIOUS

PDF

88.4 KB Created: 2021-07-03 04:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6a2c8473ecf35c13a25ba6acebf035d9 SHA-1: eafc5c5c08dddc31ce4b53a02c3030f193fc610d SHA-256: 82e699d3aaa4d0ad35814841fabf06cccb86a7dbe71cb91709744beaf86649e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on compromised CMS upload directories. These links likely lead to phishing sites or further malware, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16091d046551ed---xisirozobenuna.pdf In PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abda868fe---51506472397.pdfIn PDF document text
- https://tl-systems.hu/files/files/3151754103.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/71dc1b5f25c32f59b372ec26dcc9ab7b/10588924937.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c436c305225---suviwodusefuxanow.pdfIn PDF document text
- https://blogsma.com/files/77460915593.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5r9u1nm6mavo8oidr2e49dtkv0/vutesakamarufoj.pdfIn PDF document text
- http://agrobud.net/uploaded/file/kususeveto.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vorjvaitb34smr8dm2uv9sqdmv/94949985758.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9e1eaa3b5c61aa221a09b1b3866800f3/80345984252.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd876233e3---64994950591.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cf1216a94---vasuseled.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa61ebc1e0---xipaxugerafuwapa.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c9def823953fb6dd0525eed76e6897b1/91873927386.pdfIn PDF document text
- https://basisnomor.com/contents//files/kimimeramubipababuxukol.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aafcf5689da3f1106890505a1625996d/79708428879.pdfIn PDF document text
- http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/rolororiwimikiwasad.pdfIn PDF document text
- https://olterus.net/contents//files/jajetefozurebefakilelu.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/73861597651.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd6bcad6---44279516060.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/11479241555.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d504b96739bf771a2e49c15d44f6c689/sakijanuf.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c682659327d57e823ef907860f41cd17/81845544878.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aae170bc79dfa2288dc3947fecdf809e/zokinokefibep.pdfIn PDF document text
- http://adams-gold.ru/archive/image/file/buwopirulidotadidevawe.pdfIn PDF document text
- https://zenmobile.in/jaipriyart/uploads/files/52725114938.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+ent+doctor+in+worldPDF 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_off0000f7f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7F0	16508 bytes
SHA-256: `e6a0fe6c4b52c024d2fa24abce5d80dc424a6b535cc90c300d3ba987ce7dd29a`
`font_01_sfnt_off000122ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122EE	10340 bytes
SHA-256: `4e8ea1829bafda133d31ab4f66bf639f639a233587a8a4a681d0327789b34479`
`font_02_sfnt_off00013a71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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