PDF malware analysis — malicious · c1e726e8f082db5d

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 03:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 844087030412e308653a1a726761739f SHA-1: b0bd1f060bf70d2d15f5d7e93456ed3d4b79a2ba SHA-256: c1e726e8f082db5d88a57174e586ff33d0133dfd6008e1ef3c4d4ee73271192f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The 'memorandum of understanding' lure in one of the URLs indicates a social engineering tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d0d78a8815de86cb89511da525f3a761/4502096954.pdf In PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5d3130861975bf5933ad02cb66b13c1a/katukawipekabamenino.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c6be66f69166c9da223d9eec629290a3/97404739992.pdfIn PDF document text
- http://www.yt333.com/userfiles/20210728/file/1627414035.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/aec5f46074455df3e5054b12e07ee237/judigepovo.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a994f3e759---49098885233.pdfIn PDF document text
- http://atol-res.pl/uploads/file/20692802726.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/19753305438.pdfIn PDF document text
- http://aqcons.vn/upload/files/81771085083.pdfIn PDF document text
- https://rachelrom.com/rescontent/file/zedab.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/66g0ekd4dob8bc0ei7fg7cig76/danugegolonemaxipivamisat.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b651e42510---21132258383.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e702f98d16---menunedavugogubiwigiz.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/lanozuwan.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd9a9bf5---13611754683.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a489afd8---39811756379.pdfIn PDF document text
- http://moscowballet.ru/userfiles/file/86347361345.pdfIn PDF document text
- http://virus-safe-zone.com/ckupload/files/xobidugitexunigakupe.pdfIn PDF document text
- https://flyags.com/editorResources/file///47948413726.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8920bc548d070b21decd859335da9713/1872412022.pdfIn PDF document text
- http://phuwangnam.com/user_file/file/bonavivosubemufev.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101d26725d7---14054888356.pdfIn PDF document text
- http://raegcafe.com/uploads/files/97561546087.pdfIn PDF document text
- http://pozitron-s.ru/userfiles/file/30439825083.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2d7ac0a3---61003715392.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=memorandum+of+understanding+pdf+formatPDF link annotation
- https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tipimok.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_off0000c7a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7A0	16768 bytes
SHA-256: `9c2949c6a036e772141cb2b8473bd1ee06688b3275d4d70c47400da03ce986c2`
`font_01_sfnt_off0000f33d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF33D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B54	10888 bytes
SHA-256: `ce24ac457af2c783e47d999889a9effd514c30d83907dc5269fbe5c766bdeb93`

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