PDF malware analysis — malicious · 2ca66d85db1081d4

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d3a3372aa79a6829ef50bec45f3cfbb4 SHA-1: 2a565782fbfe79fa2f08aa794b3858a2814d8611 SHA-256: 2ca66d85db1081d4137f6f72242d5ac960fe860f1c741daa4839e9b29f56234e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content or phishing pages. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

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 https://krisoc.ru/uplcv?utm_term=frying+fish+with+cornstarch PDF link annotation
- http://renovator.cz/files/file/98473753620.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ca35846---rigegedamepirekuton.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6i1e6nru2l025tc3qmfakad7u2/31792829735.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd905dbee8---16396652184.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f9e805557e01180c219ffbec10927356/fimiketogaribakedet.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
- https://actor-conseil.com/files/file/gizax.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c187cd1a196---75799294054.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4eb59297---bejusonunifoxufidabove.pdfIn PDF document text
- https://efficientinfocomm.com/ckfinder/userfiles/files/7988356478.pdfIn PDF document text
- https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ijqave86b2cve5b8fsd8f09rnd/lirivofaxanelebumepas.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/raposuba.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q2k7d5dsdcqc48n31u5inlaft7/tokijedisenuzubaduve.pdfIn PDF document text
- http://agrion.org/upload/fichier/kaxeranorerolu.pdfIn PDF document text
- http://jncs.kr/page_data/file/20210522141651.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817677ea053---vilizu.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4bb6b24d---27042321494.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac27747ffd---duzuxezuwijijevonezobaga.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/boketirimubij.pdfIn PDF document text
- https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/30hokubtnot1bs7j7236pvcki1/55505971694.pdfIn PDF document text
- https://actor-conseil.com/files/file/rakilevobopulolupowop.pdfIn PDF document text
- https://doctmcooper.com/userfiles/files/79327939927.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/73009500825.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/33192803035.pdfIn PDF document text
- https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/74686432642.pdfIn PDF document text
- http://s292376414.onlinehome.fr/datas/imgmail/file/bafozerugutulevukawubitu.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_off0000ec55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC55	10616 bytes
SHA-256: `a4532a068c3540def414611aabc39a439926ed5094652e70ae561afa9d5ecbf3`
`font_01_sfnt_off0001049f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1049F	17740 bytes
SHA-256: `14707e0b612981a5a0aefca104e4654616e46a727b2871f5527ca3f858724ab7`
`font_02_sfnt_off000132f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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