PDF malware analysis — malicious · a5ce14243923455e

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 03:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8a606931ecf13564e42631b575f5bed2 SHA-1: dabbd64d7e18dff4eacbbdc032d4e816b5a530c7 SHA-256: a5ce14243923455efbdb0f53ca8c85be7604f712888536dbd9d8f7b50c7a841e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself appears to be a link farm, likely serving as a lure for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://goldnumber.info/userfiles/file/26398429265.pdf In PDF document text
- http://illinoislivestock.org/userfiles/file/87323875112.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa4b6bca6---53576851608.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078643297bd4---50034490829.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e2b20d8cb---6279605079.pdfIn PDF document text
- http://orderkiwicafe.com/uploads/files/xasef.pdfIn PDF document text
- http://pilot-market.ru/new/files/file/99878614847.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f89426aa40---rupuwowivesebu.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fci4fovcn1i2l37qb8st0m2660/lavexiwevogapoxe.pdfIn PDF document text
- https://patc.fr/imagesfile/vuzazosu.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2d03a272080ddcf8ef6bb5b359f77204/82790152627.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d56b8ea8a---3797999342.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cf6e3b9e9eae1e82767351dba9dfce07/dimifawumuxuferowezivov.pdfIn PDF document text
- https://nstoplana.rs/ckfinder/userfiles/files/jaripijomozigowu.pdfIn PDF document text
- http://studiotecnicolamanna.com/userfiles/files/46187154782.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/86675c9ed103a73a38e08d6887490332/xosemulusejebab.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210808195355618085464.pdfIn PDF document text
- https://cribpointonline.org/cribpointonline/userimages/file/47226939060.pdfIn PDF document text
- http://gamax-motor.cz/data/dokumenty/7177978050.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/25917390546.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305bc4e2ed4---rebewo.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/db11e292d060c54b30893f2d55da7df4/xedexadiv.pdfIn PDF document text
- http://midel.me/userfiles/file/lowifuvimebufazam.pdfIn PDF document text
- https://nonbodepsg.com/uploads/files/46179811375.pdfIn PDF document text
- http://adice-area.com/pictures/files/sisizifejoraxofabuzuv.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6e2de0fdc0d49f91072a34ea26f8f72c/bidedawemexovawobomovi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hitachi+dc+inverter+air+conditioner+manualPDF 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_off0000e813.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE813	10624 bytes
SHA-256: `d834cba724c00e067044f5b11dc268cc8b0bc52fe97be142f54362c696a43621`
`font_01_sfnt_off00010022.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10022	16768 bytes
SHA-256: `d1d8b9e87dfd33463025bf2b25faa27d58bbf171a04cda2623e7cf4989c69fc3`
`font_02_sfnt_off00012b7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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