PDF malware analysis — malicious · 4c117ea76c0f0ade

MALICIOUS

PDF

77.2 KB Created: 2021-08-28 05:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2f6d0e8f83354ba816349d5469a861c9 SHA-1: 87c7926fc96d056ed514b4a675b294d963d91153 SHA-256: 4c117ea76c0f0ade037e1a6c91e66a3e116a576f32c2225291dddc51689200ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely serve as landing pages or payload delivery points.

Machine Learning

Nyx PDF Classifier malicious score 0.9901

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ecdda89---tigefoduramejumiz.pdf In PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be6f20b4---28049254153.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448adb4b72---zuwol.pdfIn PDF document text
- http://michellenevinracing.com/FCKeditor/file/40124523707.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dd862da950f6c11d639c552e731eb527/63992421987.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8c659532---60444819282.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54995298708.pdfIn PDF document text
- http://dahchen.tw/userfiles/file/tovewamujabovilarizifawap.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0c794894---44608882716.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hqtk8j3cavgik394loup4k0lb1/3310853941.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607429839a9c1---zojobuwupojaxobono.pdfIn PDF document text
- http://domingo.hu/ckfinder/userfiles/files/tilozalobomilekaji.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a72676927ae049f345db1c3810a2e28b/sinavibogevasibanow.pdfIn PDF document text
- http://weberstellen.ch/userfiles/file/7816967332.pdfIn PDF document text
- http://karate-talence.com/newsite/userfiles/files/6165523683.pdfIn PDF document text
- http://cuspsurgeons.com/userfiles/file/76133307808.pdfIn PDF document text
- http://dispensapertutti.com/userfiles/files/kilikifevera.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/20d2ea43d47d0171d6594c8d7d4e6718/pizurugenesadelorediredu.pdfIn PDF document text
- http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/21789679271.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/18646602817.pdfIn PDF document text
- http://artgraf24.pl/userfiles/file/bowevesune.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/86d1444013bf491355133629f61dc20d/zagofexetexewulumuzelemi.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/50411288095.pdfIn PDF document text
- https://ocbond.org/userfiles/files/korasimezilukajolevo.pdfIn PDF document text
- http://mg001.cn/upload_fck/file/2021-5-8/20210508163004537641.pdfIn PDF document text
- http://burchiellati.com./file_fck/file/84496836298.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5ec28aeae2176635709f9b7c34f4e46/watijanetepi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+insert+multiple+page+pdf+into+wordPDF link annotation
- 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_off0000cb9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e3b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3B1	16156 bytes
SHA-256: `8f66f2067ef88daa5efaa15e7a37edc36e30fd1f652794793387a949cc2874bc`
`font_02_sfnt_off00010d65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D65	11016 bytes
SHA-256: `b7b17b31ed4857075f872d4565efcf0b4b85d9d88e6d78faf02e36c58812dc99`

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