PDF malware analysis — malicious · bc9c64a5365f785e

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 11f78c72642791642b2a0e5c257ca046 SHA-1: 167276b3df22ca2c81378e7b69e7570c1f4c88d6 SHA-256: bc9c64a5365f785e87d08a4f719ee64afa4c034f2e5d62779c52f48e0226102d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://queure.ru/uplcv?utm_term=radiometric+dating+worksheet+key PDF link annotation
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff14313da---meletix.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/zepifalotawifixanagozifu.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708244bb52c---30907663817.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c91df2d6---kabewedefus.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f326bd003---48813121628.pdfIn PDF document text
- https://ascinfratech.com/clientprojects/trading/file/kiwunanexinudinetir.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff198af380d---43864531721.pdfIn PDF document text
- http://www.77ice.com/upload/files/wudenoloke.pdfIn PDF document text
- http://xn--80aamdqpfpr.xn--p1ai/upload_picture/6758234020.pdfIn PDF document text
- http://fw-simple.com/uploads/files/90244201721.pdfIn PDF document text
- http://akifkasaboglu.com/esatfisek/images_upload/files/nekufaxasef.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f77cba860f4---97885498270.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/leputev.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/74878235157.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d73cce0e28a---bumofovabogeb.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/576d18cc50dcd45b4787d9127cad3619/55409036389.pdfIn PDF document text
- http://keyday.ru/files/files/29353573112.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5sv68s738ajd27qe1iom6o3fh1/wabonusesurakuposumula.pdfIn PDF document text
- http://aj-logistics.com/stock/userfiles/file/14292867884.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cbf959bf35f82d799efc3408c7baf318/moxuw.pdfIn PDF document text
- https://adtw1.com/ckfinder/userfiles/files/93153237305.pdfIn PDF document text
- https://xosobacninh.vn/webroot/img/files/poxabesiwakanokukebavofa.pdfIn PDF document text
- http://italiangreyhound.pl/img1/userfiles/file/zogebanuwinetekoxefaguta.pdfIn PDF document text
- http://gagutp.com/sa_upload/userfiles/file/20210613040127.pdfIn PDF document text
- https://partnermind.cz/images/files/damawuxunosejemakafo.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://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_off0000c252.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC252	17368 bytes
SHA-256: `a8890e10847d48ff01ea77199cc3f36dedbe52e863a362d3f2fa2b3dcc13e91c`
`font_01_sfnt_off0000eefe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFE	11108 bytes
SHA-256: `97538343af1cba18aadf87b1b637d317cb010091bdffdd006e4f210683216528`
`font_02_sfnt_off0001089c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1089C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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