PDF malware analysis — malicious · 853a7811f1f19e25

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 14:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 8175c140923f93c479b0d6f70160fe53 SHA-1: d3afcd33e1f2439d629fea191cc1f879870a19b6 SHA-256: 853a7811f1f19e25060c3e24ec7ac1ba2ce83e61ecfe92977df7a9a0fa543239

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or spam campaign. Although no scripts were explicitly extracted, the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://catamma.ru/uplcv?utm_term=hack+shadow+fight+2+mod+apk PDF link annotation
- http://villalapinetafavignana.it/userfiles/files/wezixagizaloxikinetuwugu.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/20340866586.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb0bebe03---xabaf.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff60eb8c16---19556566183.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613385017330c---lagar.pdfIn PDF document text
- http://bbmpva.nl/fckassets/file/22415476923.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614785584aa57---51953059927.pdfIn PDF document text
- http://hvezda-pardubice.cz/files/file/78698164262.pdfIn PDF document text
- http://mprime.net/ckfinder/userfiles/files/1707990510.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec58244bf---6067425764.pdfIn PDF document text
- http://artin-intranet.com/ckupload/files/kijojoxax.pdfIn PDF document text
- https://kluchar.net/klucharnet/images/file/96804876420.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e568f64375---vifejilijitevapuzoloxa.pdfIn PDF document text
- http://eko-gospodarstwo.eu/files/file/moliwatogivepeluzoxa.pdfIn PDF document text
- http://yusungchart.com/userData/board/file/kisimiladuxade.pdfIn PDF document text
- https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vebipoxarisoxobilew.pdfIn PDF document text
- http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdfIn PDF document text
- https://imagebrandstudio.com/userfiles/file/mosesofoba.pdfIn PDF document text
- https://casalindasbakery.com/ckfinder/userfiles/files/1157177966.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/16152137772.pdfIn PDF document text
- http://studioagronomoserragiotto.eu/userfiles/files/77606468707.pdfIn PDF document text
- http://contextuae.com/resimler/files/tezatajugigaporopikajof.pdfIn PDF document text
- http://fpempresa.cen.es/userfiles/files/57597788936.pdfIn PDF document text
- http://gdfsztal.com/uploadfile/files/vinegovozugilov.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_off0000e14c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE14C	10976 bytes
SHA-256: `b169cf966ae9dff82934425b562e0e054f698352c2701d0749fd2e921597cfce`
`font_01_sfnt_off0000fab4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAB4	18652 bytes
SHA-256: `077057272df49507118904f947cc7f8fc2536de2a994b5f78bd122a712f32121`
`font_02_sfnt_off00012b67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B67	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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