PDF malware analysis — malicious · b0b5980d2bd0f32e

MALICIOUS

PDF

73.7 KB Created: 2021-06-22 23:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: de3b282b17cc78d562866ecaf97cf04a SHA-1: 877f08e0ca6d9ef0c89d1a8f9407c7e61d3f9c9e SHA-256: b0b5980d2bd0f32eb7e84fec2c0816d781c2ecf039465839fe619481681073b0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised websites and potentially disposable hosting, likely for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=cea+application+form+for+central+govt+employees PDF link annotation
- http://temple.mo/userfiles/file/87835630244.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fe33e5949318501537a505b224849d5/83806423330.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfeeed4651---xaritomuk.pdfIn PDF document text
- http://akinmedikal.com/uploads/file/ramogiraje.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6247ada3c1---xagapamexodijedijo.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f625f99f58cde896581c6f1a03af5c6f/mitutusufutivogur.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/filolegosofon.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2840dcfdef371560d0a13050731dbbf0/32806404687.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3434835e25---bumokatozasixodujesavuke.pdfIn PDF document text
- https://angkagenap.com/contents//files/73096157380.pdfIn PDF document text
- http://anaminfo.com/attachfile/file/tumumo.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b128e0e69ff---wodubanigul.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/sipepejexabumudivukudubog.pdfIn PDF document text
- http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed5e358b5---fawuvere.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70629c760a---1507131514.pdfIn PDF document text
- http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/49941826633.pdfIn PDF document text
- http://france-ex.com/mivitakolabaxepox.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dac8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAC8	5308 bytes
SHA-256: `22037bc2eab1167a5f587da56eff5cee6c662995306840b610710b2fcfa4a65e`
`font_01_sfnt_off0000ecc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC8	10968 bytes
SHA-256: `5ae3e2d2130309e4b2a871c49bd6983ed096607f91c60a1f1228c4994b5ae689`
`font_02_sfnt_off000111e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E1	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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