PDF malware analysis — malicious · 2dac4a92951b5d96

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 02:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 7ed72565a1ff9f7675a8a9aa23503801 SHA-1: 8f8bf450edd26e65ecf362f38b1a2193230be428 SHA-256: 2dac4a92951b5d96d3c3d2a45f8fcd9e30edca3f98a6779389c572432f1f69f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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
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://allytemp.ru/uplcv?utm_term=remove+hidden+apps+android PDF link annotation
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16096df159541d---busepodewejuvosabatekivu.pdfIn PDF document text
- http://iamsong.vn/uploads/files/mubakomawexavo.pdfIn PDF document text
- http://zzliuxue.com/upfile/file///zuxenemufew.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f648f411---50936273172.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/035dfc71ea0283035b76e71cacc68495/rovuwifidew.pdfIn PDF document text
- http://grandinspirations.com/clients/75274/File/70492746826.pdfIn PDF document text
- https://texigo.tw/upfile/files/2021/06/19/bogidabesasadebulifiji.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2114ae3e0ad1704fcb13e7f96aaa96c4/14798623304.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081099cb9f7e---46989120636.pdfIn PDF document text
- https://grup-insaat.com/userfiles/file/34291310995.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c770ee849bb---75819377006.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/nizedawixetebesizudure.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/bomewinorakalos.pdfIn PDF document text
- http://healthywithhart.com/res/file/rukof.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47f713c72---86460500011.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c0be4272016777a0157a281b1839fd91/ponipumoweluzu.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d577028bbb---xubupajoj.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2a827ebcd59db6d10610207af9f7c7d1/zidunegabekumulaz.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/749d6cebccd0ceff77d0936e7b5d2cab/gedakiwavuburanu.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c08eb9d45e9fe13334d01f91dfff7076/8709762914.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5244d181146cf77aad14a08a3bd0c8ab/gojuwomexobejulejupopog.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/56330519731.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e71f04f11---58277230985.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb46683b6---3262643292.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecb39fa0---bexese.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/wokenemakupabele.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_off0000f448.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF448	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C5A	17252 bytes
SHA-256: `cd3f14295d31e448e9477ae9d3a5f91bde10aabf32f34d259472926f34f56e81`
`font_02_sfnt_off00013934.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13934	10624 bytes
SHA-256: `b37e516f117cec1a518e453773a6fd85626f426e306745b766084e99a895b2b9`

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