PDF malware analysis — malicious · fdb66562e15503a8

MALICIOUS

PDF

93.6 KB Created: 2021-09-01 19:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1b13e5db72fad385cd4c5b134a58ada6 SHA-1: 0e5af55d48b6267e6d1a7f490d721c203d84b8b5 SHA-256: fdb66562e15503a83d14f6e5bc06001b92c61c945c05d4a7f600dc40e9418d3b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users into phishing scams or download further malware. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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://synerhu.ru/uplcv?utm_term=banh+mi+thit+heo+nuong PDF link annotation
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/94323b9538bf42d68a2bef7c9d320b83/56804376900.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/jdi07nq2epa2f0ll8dvc4fdss7/lajuraxa.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96da26ef3---zozisekalikowajibomabuwiv.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55e81c8c2---51584878016.pdfIn PDF document text
- https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/55e11fce9b594577d20604e276d94413/80382203012.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf6a39dcdf---resox.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b60b034e2ff6ace831a578dc0993ede6/werutu.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/rilamawifaxoxiw.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/31fb216d99c204a476ecd098d92529b6/gefogowututi.pdfIn PDF document text
- https://rajakeempat.com/contents//files/betugapovijojuban.pdfIn PDF document text
- http://sasnowosielski.com/ckfinder/userfiles/files/37000982419.pdfIn PDF document text
- http://amon-syotengai.com/userfiles/file/xewigewuj.pdfIn PDF document text
- https://asi-filter.pl/files/file/zuxiweb.pdfIn PDF document text
- http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kurozibodupedixu.pdfIn PDF document text
- http://3q1p.com/upload/file/210724024113599752n9gsy3fck20f.pdfIn PDF document text
- http://jevades.com/aircraft/fckimages/file/41406031675.pdfIn PDF document text
- http://thankschicken.com/uploads/files/duxizekufimukuxitufatup.pdfIn PDF document text
- http://hotelgiottotorino.com/userfiles/files/22117211009.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd497463f4f76c03d9f3334dce24a4d7/93817915675.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2e34ec9b68e8921d6e334f2e9433b5a2/vuwajimitedaw.pdfIn PDF document text
- https://carcable-bg.com/uploads/pictures/files/83686861663.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/besowawukib.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/25864850107.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/91902118122.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0b39d3e66---visatiruzufabigoxulav.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e33b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE33B	23640 bytes
SHA-256: `8ae88e691243bbe35db94661a44335ee1c6026e70d4ef11c0cd41d8354bf523b`
`font_01_sfnt_off00011f4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F4E	16616 bytes
SHA-256: `9625fb6854ec2d6da67d41fc4433527bc8aa89d45786af196e45ba74024aca9e`
`font_02_sfnt_off000136d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136D7	10392 bytes
SHA-256: `b358a6b5f577b52840bed2ea88110bc3f79b5181b84629f8e303a3803cca846d`
`font_03_sfnt_off00014e2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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