PDF malware analysis — malicious · 0aecf2d2e257ba0c

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 05:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7f1bdccd84d36dfeaacae2703f5da3e7 SHA-1: 5d9c5a913d16ea29c8a3d1a0ccb05c30ecebfb94 SHA-256: 0aecf2d2e257ba0cfa8f22dbbd90c160e6a9b35713f47d8110ac66ae53f4ee28

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains. These links are likely used to distribute further malware or conduct phishing attacks, aligning with the characteristics of a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://vaness-sens.fr/ckfinder/userfiles/files/12123353785.pdf In PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/37586bc5baeb78d455fae1bc24c618f8/14263388055.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ddb8a181---nexarukuvamasu.pdfIn PDF document text
- http://vattuxaydunghl.com/userfiles/file/28076128306.pdfIn PDF document text
- https://topaldanang.vn/uploads/image/files/15501155675.pdfIn PDF document text
- https://angelsstaff.com/uploads/file/24152034698.pdfIn PDF document text
- http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/52204257617.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160efe9c603212---ginak.pdfIn PDF document text
- http://auto4-spb.ru/public/images/ckfinder/files/wupaxudagodididilol.pdfIn PDF document text
- http://ebsenglish.net/_UploadFile/Images/file/15714898606.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/770e2pb40c1o4cea5i8tm7lj7l/vojibewajedajatovenibebur.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/87423714617.pdfIn PDF document text
- https://carmelocuritiba.com.br/ckfinder/userfiles/files/23635728251.pdfIn PDF document text
- http://ghibms.com/userfiles/files/59554611896.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/bf9d327ceeaec221f3067972a703a9b8/5718200920.pdfIn PDF document text
- https://forexinc.ca/upload/editor/file/faxefipigonedegalixuzal.pdfIn PDF document text
- https://digireg.dk/upload/jonerarizizijol.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e95571ce---wasudubesumokasas.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7d3550d8---nezelikujotegizezu.pdfIn PDF document text
- http://nocleginaplus.pl/uploads/userfiles/files/6293220411.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/lizalozemodez.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079255552980---fubizasovexumawabanut.pdfIn PDF document text
- https://pasarantogeldua.com/contents//files/jaxer.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb61e05867---5880640285.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0343991c1---29209116997.pdfIn PDF document text
- http://helloshoppingnepal.com/userfiles/file/16682179229.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cook+county+commercial+property+tax+ratePDF 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_off0000f249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF249	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010a60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A60	10808 bytes
SHA-256: `48e4f067b419dd9c50e331e0a8cea36139e246d3933290e77a9aabb94734e618`
`font_02_sfnt_off00012349.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12349	17132 bytes
SHA-256: `ba7ae4b06bc0cf183139c5fa207c366b8e7a136b2f43a81aebf01c07548d1001`

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