PDF malware analysis — malicious · acb04952bcab30c2

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 04:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: fb561dbf069fc3bfddf156ac8d3bbe7e SHA-1: 845d5a831fc6cd754beee18a8053d8841a4e442b SHA-256: acb04952bcab30c24f23e354bccefd7036b9a291e587d9432eae52559389d4e6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to disposable hosting sites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware. Heuristics indicate a high probability of maliciousness, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://crewmak.ru/uplcv?utm_term=logitech+g903+manual+pdf PDF link annotation
- https://palcev.ru/userfiles/file/39306099625.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/datanupa.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac7ae84d37---xefuxopogabigomafijavure.pdfIn PDF document text
- https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0o1vmfp1hn20o4cuh4vlq33564/28890212753.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/14327741529.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1ierlnpq954nlr56hdm403i2g9/2220642917.pdfIn PDF document text
- http://php-lounge.de/userfiles/file/fevavixadujulozekunugapis.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/96bdf4fdbc429c7b7d54e738bbd17986/6766871897.pdfIn PDF document text
- http://lyjclinic.com/ckupload/files/bewovitamuxafokogasudewed.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hh384c480v7p8vmjvrcdsu9if4/52951074518.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/35321784438.pdfIn PDF document text
- http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/90003484207.pdfIn PDF document text
- http://builderall.info/userfiles/file/93742351820.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe57e8df7---midemadoxur.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/41f42cc5888cd75b30bf8409d1cc7059/ziketedijupakobebazoluta.pdfIn PDF document text
- http://theaterbuehne-schwandorf.de/userfiles/file/15194289615.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160786bedc97af---14612676300.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1990fa0c58---zanuzememusurapotez.pdfIn PDF document text
- http://pizzeria-millemiglia.de/app/webroot/img/editor/file/97773018885.pdfIn PDF document text
- https://kovosluzba-praha.cz/res/file/3665455081.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/42b1998a2226fb324ef4d8b61c22dd74/12854608338.pdfIn PDF document text
- https://skvacations.com/userfiles/file/jivefububu.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9a0b10389c7f2b1ffaa92e400dfc1e49/14665771531.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9c5pdos77vk1ki743j06fkfvm2/70352438204.pdfIn PDF document text
- http://nhasachnguyenvancu.com/Images_upload/files/41844391843.pdfIn PDF document text
- https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/22472383282.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/fivibefebodezubopizofite.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9A	18924 bytes
SHA-256: `b45f3d3f4d9e4095bb50c6a7492ec9c9d82eeb975a284463a2c3724deddae3e9`
`font_01_sfnt_off00011c2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C2B	11316 bytes
SHA-256: `3b9c403afb9f234de4480a53ce2086611cd0adb925a2911a773ac9244d3ff497`
`font_02_sfnt_off00013668.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13668	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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