PDF malware analysis — malicious · bf5b8e5fc803f147

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 22:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9419e084978570e96709eaf3ca97d956 SHA-1: 4f237efe750e0413e9c4325e5a8fd93dced0811a SHA-256: bf5b8e5fc803f1475beb22d93bf74063124fffde6cdde52b9b4a1aab6796ed02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=cara+reset+manual+lampu+indikator+printer+epson+l210+berkedip PDF link annotation
- https://espaciocultivarte.com/ckfinder/userfiles/files/redimoxu.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072905d036d6---rogadorewefuza.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2f826a6088157487c6c7fd212a37949a/febafulodafozawuwakutiwux.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16129603078779---89633387297.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/983e396a40869fbbe83572cb66b0bc52/nagofobedemuf.pdfIn PDF document text
- http://suapaiatuipelehakefamily.com/clients/80707/File/fozosupibowawufezowovigok.pdfIn PDF document text
- http://flightshop.jp/images/blog//file/73761048101.pdfIn PDF document text
- https://netshopnepal.com/userfiles/file/debonaxotabelo.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8g9o50thht0005o079junfumq6/memalijikiximewimixi.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tn2u7c4hdptkfc7e2f92mm03n0/gexodetinamivitezexor.pdfIn PDF document text
- http://bungefamily.com/clients/5233/File/tovozidukufitozego.pdfIn PDF document text
- http://phoiinnhiet.com/images/uploads/files/vakeni.pdfIn PDF document text
- https://mobspace.xyz/web/img/podborky/files/97706427.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9451ced3---13540854909.pdfIn PDF document text
- http://droneducational.com/admin/userfiles/file/dumafegubiziwuk.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6b6bee681f69b456acec397c58dec1ef/ludelopiditef.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a461f22360d---saposeja.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/fitelud.pdfIn PDF document text
- http://hodinovysoused.cz/upload/file/74366499659.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f781207e7d---mazojiferamer.pdfIn PDF document text
- https://iwnta.com/userfiles/file/jabetewamikewape.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c17558e31---sitibajiguniv.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/55e375843a1bef804adfd466b4f13304/77012766199.pdfIn PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085794190014---43555220205.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_off0000e54c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE54C	17004 bytes
SHA-256: `07ba429fbcb2105b59abe6101958a8a48401618170da81b24ccd241ed111fa55`
`font_01_sfnt_off0001111a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1111A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012931.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12931	11208 bytes
SHA-256: `5bae77cc4d1e62ef5847ea5fcf1c5e4689e5e3bf398b45e42862b5703cec07c1`

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