PDF malware analysis — malicious · d626351a65c93779

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 14:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6f2153389dfa01125b7e37e6c4f2f043 SHA-1: c2e0d1c16d506430940bc9f275a92ec32ed1dda2 SHA-256: d626351a65c93779da75fee9a28560ca9fe62958cf456e5744c05bc64ff91373

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is detected as a malicious PDF by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The PDF's structure and the presence of external URI heuristics suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

Nyx PDF Classifier suspicious score 0.3549

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://archism.ru/uplcv?utm_term=restaurar+configura%C3%A7%C3%B5es+de+fabrica+samsung+duos PDF link annotation
- https://rachelrom.com/rescontent/file/turofurazubokoxote.pdfIn PDF document text
- http://www.cavice.fi/tiedostot/files/96645671223.pdfIn PDF document text
- http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21213770952.pdfIn PDF document text
- http://nfc-lampang.com/user_img/files/65352673498.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138de56cee33---damunu.pdfIn PDF document text
- https://bunianco.com/other_files/File/zegoxolediwanerisipebif.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/jifavisov.pdfIn PDF document text
- http://old.arcnet.org.tw/ckfinder/userfiles/files/60284164519.pdfIn PDF document text
- http://oshcongregation.com/userfiles/file/32730973309.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/60878270632.pdfIn PDF document text
- http://thebankcardservice.com/uploads/files/7724411763.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/45739d81cbd0341bcdfb373fff84609b/19103796259.pdfIn PDF document text
- https://hobbes-group.com/upload/files/bolobu.pdfIn PDF document text
- https://preciseenergygroup.com/media/48524894300.pdfIn PDF document text
- http://herbwaterthailand.com/userfiles/files/72739049129.pdfIn PDF document text
- https://fwstc.in/userfiles/file/61821183955.pdfIn PDF document text
- http://studiotecnicobonoli.com/userfiles/files/15367149908.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb60bf2e53---menanonujuzen.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-02/2109022212524105436bkefvc06ee2.pdfIn PDF document text
- http://king-ber.com/UploadFiles/file/20210905105446945.pdfIn PDF document text
- https://procogs.com/FCKeditor/file/49447427164.pdfIn PDF document text
- http://www.uc-kushiro.net/images/library/File/98813961978.pdfIn PDF document text
- https://vinatech.com/userfiles/file/92140361047.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67683717810.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_off0000c365.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC365	11480 bytes
SHA-256: `2b5ab34c5378d032b6767158b1472113908012a403009c83051ad7a2331475cf`
`font_01_sfnt_off0000ddc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC3	20316 bytes
SHA-256: `7ac13199c315407b41f4c86d07426eed99819917b443a30e94e02b7b0689f715`
`font_02_sfnt_off00011017.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11017	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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