PDF malware analysis — malicious · b8ccaeffbfc001aa

MALICIOUS

PDF

82.4 KB Created: 2021-07-16 16:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 828036618978011b1f2c9d1d4d3024d2 SHA-1: c3941a2059c336f6f3a9e8e274d8aa000bd5d065 SHA-256: b8ccaeffbfc001aaf908ebf84ce8e4e4e18160bf109770d4cff2f3d607ad27be

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this phishing and malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=ibm+rational+software+architect+tutorial+pdf PDF link annotation
- https://carrieres-pierre.com/userfiles/file/99781485527.pdfIn PDF document text
- http://bursaceyizgelinlik.com/images_upload/files/25867337289.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p4vceej5f1vp351gqt4okkb3n/73562104996.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071c159bdc37---ranewokafajugagudiwapig.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/343965c0802c2603e1bc47062f90e0f6/3377241243.pdfIn PDF document text
- http://mbcasc.net/imgs/file/gaxugowavuredeseno.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/gd8oh1c07m8nqq193lju7vfgke/6688228262.pdfIn PDF document text
- https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/fa8afd88ab43c50de590f646b6942a3e/19416247068.pdfIn PDF document text
- https://ocw.tw/uploads/files/43647333862.pdfIn PDF document text
- http://bearcatbb.com/CKEdit/upload/files/88662446015.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb2ecc7bd---8216129512.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b67bfd5a204b02c21b1e1d3f34a143cb/fojanojopaxosuxada.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j4isbhfehdb253mj7vinsfqtbo/15794694577.pdfIn PDF document text
- https://cncostruzioni.com/userfiles/file/korixefijukax.pdfIn PDF document text
- http://tourister.kr/userfiles/file/22489618908.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/dejadezixame.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4e48c85b4d11ed56fcac90ff153bd54b/70263908181.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc5a088c8a---saloxuzelezopefogaf.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/josejaxe.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/46050791614.pdfIn PDF document text
- http://lucann.com/Upload/file/jopojupu.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/61632403426.pdfIn PDF document text
- http://heydarbaba.org/resimler/files/bogejemurag.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db48462c09---50600835930.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_off0000dc72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC72	17324 bytes
SHA-256: `053b2061571d9d118ed52f7cdad5279eb87b863869bb4802882bccc724ec82a0`
`font_01_sfnt_off00010a1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A1A	11160 bytes
SHA-256: `eb2b2d16fa01ca4fd90070ae12766885594f5ebade66890c166b4f74625d1578`
`font_02_sfnt_off000123d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.