PDF malware analysis — malicious · fa12367dfb0b8c6b

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 21:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4bdf058604c45fb2e2fd3da03df48459 SHA-1: 321bc28cf49ee0899a5805839ba892c219dbe6e2 SHA-256: fa12367dfb0b8c6bf5efd237d4c12cc965d31b90bf60ba450a3eeaa10e505a1d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=variational+principles+of+continuum+mechanics+pdf PDF link annotation
- https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/17202668904.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/puvasuxitowugowukofotig.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a296c625e35---jadanitomof.pdfIn PDF document text
- https://studiecarriere.it/uploads/file/tilume.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d7b630001ebb4fbba83acbb2bd3854d8/98940802220.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b8122c62---99530249834.pdfIn PDF document text
- http://local-minicab.com/survey/userfiles/files/dapoxejuvevolekazab.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880e12a7d7---gosafazu.pdfIn PDF document text
- http://yangs-ns.com/ckfinder/userfiles/files/20210804184217.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7b04b4a8e1586ef8c9bcfd26f846df2c/zipire.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609511e4cfead---95798171856.pdfIn PDF document text
- http://arebiatours.com/uploads/files/52804726703.pdfIn PDF document text
- http://kiuanai.com/userfiles/file/zaligek.pdfIn PDF document text
- https://guruamardaspublicschool.com/userfiles/files/89033635163.pdfIn PDF document text
- http://freewest.at/babupigibixitudabifin.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eaafda6940102eba87f67c7da33a3dc6/43668554843.pdfIn PDF document text
- http://casier-a-bouteilles.com/file/44899872959.pdfIn PDF document text
- https://deltarents.com/upload/ckfinder/files/fevivipujezudujerirala.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c704c827f94---48821935695.pdfIn PDF document text
- http://babamoleskine.com/files/file/23744697387.pdfIn PDF document text
- http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/xokavuwiwozapawawinawun.pdfIn PDF document text
- http://latexindia.com/userfiles/file/nepididekuba.pdfIn PDF document text
- http://okna-stv.ru/userfiles/files/kekijamevirobamasegunuge.pdfIn PDF document text
- http://dietaltop.com/userfiles/files/dejoditugosepo.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/pusidirize.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_off0000f9c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000111d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D7	10952 bytes
SHA-256: `2533dc70f1e4e8664d6f6b7cc3157501354d23510279c8f7d44bc5796e56619f`
`font_02_sfnt_off00012b0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B0B	18288 bytes
SHA-256: `2da2d8cb6a13a0d4ab5b3ae654d08ccc9c23944f9264deea8bdbb2cb921059d2`

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