PDF malware analysis — malicious · 6e7e8bc532684de1

MALICIOUS

PDF

97.5 KB Created: 2021-07-05 22:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7b88697b0c2937ae0a5472ed7938d0b1 SHA-1: a556d33b1556e7219c6c132677198d1dfa8d1ff8 SHA-256: 6e7e8bc532684de1bd01c813f1200fa0e801ecae8eeac8eba848447695af3054

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress installations, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://rydelko.pl/userfiles/file/49113898907.pdf In PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/535ba31db0330649092aabf2a86b652b/14828917203.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9b3daee6cfc15188024dfdcaaccaecf8/45600582915.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7528795777---4415455306.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1b1c8cf693b914063b7910ebb41b29b2/lososazeroweguwimolone.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0ad7cb77---zewagemoludomumo.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9eb7e34a27884f6c692450ba63b3980c/9459083446.pdfIn PDF document text
- http://short-story.ru/upload/file/50400865689.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/budofowigevovaposadeteg.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5ccd278e3---xewukobunulasijovoxa.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1560571ef346143b0d0b4c2c40c6b25d/16366540597.pdfIn PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3e04771da13cc0cdd91cd12e92df3a1f/5637734345.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/38452493901.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0273363825---wanazuzufudor.pdfIn PDF document text
- http://www.gabrielamaciel.net/images/content/file/tibifo.pdfIn PDF document text
- http://sartoriaventurini.com/userfiles/files/59434502501.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6abe77dd1---levedugu.pdfIn PDF document text
- http://mclarenquartz.in/ci/userfiles/files/vunulukababatigipek.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/mdhjs6lodjk0pkubmi3hif1ts4/texudosejav.pdfIn PDF document text
- http://offerseir.com/basefile/offerseircom/files/96240095097.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/38883705074.pdfIn PDF document text
- http://daindnc.com/fckeditor/userfiles/file/wegotasuputogatekajoda.pdfIn PDF document text
- http://cpspcb.com/uploads/files/5597013765.pdfIn PDF document text
- https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/l1ufu3jntnrh4ioc46vnttk24i/82947068392.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/baf79650d6c99283a699bb5332c33002/lokuga.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=blackpink+knowing+brothers+eng+subPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f692.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF692	17968 bytes
SHA-256: `3b9690e9eaee5c05afd992a5779a4d9f0922cd968d782521a67972b86cf79d42`
`font_01_sfnt_off0001125e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1125E	11124 bytes
SHA-256: `81387ce224c3543102394ce7c6d15dc612164515616a86d55b1a3734911e7664`
`font_02_sfnt_off00012c33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C33	20312 bytes
SHA-256: `bb1c2e47d70aa8ae930792454943eee8619ed9e234a6c245c3f839a07de019d6`
`font_03_sfnt_off00015fec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15FEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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