PDF malware analysis — malicious · 7efd92859de16148

MALICIOUS

PDF

66.5 KB Created: 2021-09-27 20:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 0afed3c422590cf9d6474702aad1ff94 SHA-1: d1ef472739e23e2e40a6d454b221321374ab51ab SHA-256: 7efd92859de1614814ebed166abedf3a8046ebe1fbed85faec7c6fb6da9c07f9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of small PDFs acting as link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

Nyx PDF Classifier suspicious score 0.3697

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://coretry.ru/uplcv?utm_term=only+pubg+lite+apk PDF link annotation
- http://aylabawadi.ae/userfiles/file/mogapazarezoxuridugopagi.pdfIn PDF document text
- https://www.cascatai.com.br/ckfinder/userfiles/files/lajafivojujepu.pdfIn PDF document text
- http://atol-res.pl/uploads/file/60755178642.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a682b6fe---39468715485.pdfIn PDF document text
- https://777mto.org/contents/files/pefaxowetakiliwosaxu.pdfIn PDF document text
- https://trade.inter-ural.ru/ckfinder/userfiles/files/wuvidixi.pdfIn PDF document text
- http://aotwresort.info/ckfinder/userfiles/files/zojir.pdfIn PDF document text
- https://fundoohairstyles.com/hairstyler/images/file/vezevobewapajujir.pdfIn PDF document text
- http://redigonda.it/userfiles/files/37044192140.pdfIn PDF document text
- http://autosklo.sk/pictures/file/gufaw.pdfIn PDF document text
- http://elsped.hu/files/file/74590478184.pdfIn PDF document text
- https://goldengatetaichiqigong.com/userfiles/file/gobixe.pdfIn PDF document text
- http://dongphat.net/upload/files/vatomigefavisuj.pdfIn PDF document text
- http://abwessex.com/uploads/files/pewosijawopegewanajubik.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5dfdc5f60a2e1b7848973de85c464540/98586953030.pdfIn PDF document text
- http://lamardaegu.com/upfile/user/file/47414543168.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161331f090607b---10315175229.pdfIn PDF document text
- https://almavilag.hu/files/files/51515321776.pdfIn PDF document text
- http://lustigersteirer.at/userfiles/file/pamolenigapetalo.pdfIn PDF document text
- http://festacreativita.org/userfiles/file/sawipi.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f000ac1082---3287491202.pdfIn PDF document text
- http://espwireless.net/uploads/file/vugekubududedumobuv.pdfIn PDF document text
- https://solener.info/ckfinder/userfiles/files/81186312699.pdfIn PDF document text
- http://zima.italie-ubytovani.cz/data/file/bepotadumojodibitu.pdfIn 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_off0000af57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF57	10508 bytes
SHA-256: `71067f0275470a97a358e4bc7a6cd0e207fe0605a50a91dcfdc8e5feea35ae5e`
`font_01_sfnt_off0000c733.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC733	16000 bytes
SHA-256: `946a5cf3e4e4b6233bf74f3f2cbb7ac27e290a1fe0615f6670e9ef16039c2fe8`
`font_02_sfnt_off0000efc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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