PDF malware analysis — malicious · c68be6c89ab5b532

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 00:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 323566cb57adbc29daa11df3d6625c8d SHA-1: 164676f26c06258eaf0c1d92c342d8bc784674c8 SHA-256: c68be6c89ab5b5322b34bdb1f5a93e718f98a55a9552f2de65e22dd1f41588cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://drafthe.ru/uplcv?utm_term=puntillismo+pintura+manualidades PDF link annotation
- http://bettynblue.com/upload/fck_img/20210509/file/lupojowikilukej.pdfIn PDF document text
- https://papiratisk.cz/soubory/72086707388.pdfIn PDF document text
- https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ffdf0f86fd239569e0feb580261f5c9/fobulo.pdfIn PDF document text
- http://slenderclub.cz/ckfinder/userfiles/files/mekofagusogomozijit.pdfIn PDF document text
- https://happyfun.tw/uploads/files/202108200821188754.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791793872b---fikipetem.pdfIn PDF document text
- http://peaktoppet.com/ck_imgs/files/popivazex.pdfIn PDF document text
- https://adasms.fr/userfiles/file/dutadanexisabonewop.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dpnedfm9gh13blvjv3aec1e71c/34072621256.pdfIn PDF document text
- http://d-a-s.cn/userfiles/file/49691174258.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609260b8482d0---72279110288.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/80135331878.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210618_034504.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/635df3d77c6db362be4752d0b85107aa/51106236939.pdfIn PDF document text
- http://hibertek.com/image/files/20210810_103032.pdfIn PDF document text
- https://rumputhijau.com/contents//files/dupexusolopu.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087121f99ca4---depopasiposererenibivi.pdfIn PDF document text
- http://lex-ter.ru/admin/ckfinder/userfiles/files/1063568596.pdfIn PDF document text
- http://rudolphi.nu/userfiles/file/74953828930.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46f19fb1b---97691550719.pdfIn PDF document text
- http://reversetheclocknow.com/ckfinder/userfiles/files/57013282287.pdfIn PDF document text
- https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/5d85cfa3343a732af8c005cf7e25b5c7/99978333244.pdfIn PDF document text
- https://asset-books.com/userfiles/file/zokodu.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17994aa808---5227999393.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3brdc0hluos5qgf2ng1hva5d01/93860289613.pdfIn PDF document text
- http://vet-arrighicolangelicristilli.eu/userfiles/files/dojisotojoka.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/99v65b1bf8pers84ismrac0ph2/magigavomidedopin.pdfIn PDF document text
- https://tauthuy.vn/upload/files/pofobuvegemowedeziv.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_off0000e2fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2FD	10656 bytes
SHA-256: `2388631d530055c7cfd68c4648af37b05b70ddae5697f5a488b7ef85eb3a480a`
`font_01_sfnt_off0000fb61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011373.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11373	18404 bytes
SHA-256: `b81f4cd05ecc1c8812db63aba0e36fcea2a6a9c0fa4ecb8cb7b9ee5d60109006`

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