PDF malware analysis — malicious · 1b788f8d3127db8c

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 11:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 915461398999e641f5af20008099a9eb SHA-1: 101a4f73fc5e49b0760a16bc5f2f3811c9ef306d SHA-256: 1b788f8d3127db8c0b121c9e8a03736667de97e52f58d4e201bfebb1f0beaf95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used as a link farm to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=amar+ujala+epaper+pratapgarh+pdf PDF link annotation
- https://geneolock.com/locktactyuma/userfiles/file/39087764841.pdfIn PDF document text
- https://pfollowers.com/ci/userfiles/files/77114541289.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88aa34305---nujunoxutajepidevofuvi.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/fafokirobajazopumugizo.pdfIn PDF document text
- http://centronegozi.com/public/11732433928.pdfIn PDF document text
- http://chinamakina.com/userfiles/file/watoranudemezug.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n4dpqsoiiqr7jqrb8d54s9pdl8/xokexegige.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/33756875312.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38e383964---ronixebokesapo.pdfIn PDF document text
- https://lecormier-menuiserie.com/www/upload/files/zidewipokemipisopo.pdfIn PDF document text
- https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/70f9316c122dd317cf9171926889abdd/niwodetizegoxune.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e21e43af0ca34285818a28711a10a89a/tomopikajidamoneloso.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9274fa9eb531772d728890a7c6f8b6c8/35590004673.pdfIn PDF document text
- http://parfumkin.ru/files/files/tedewuxuwalabinow.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae115e7fa---koxofagal.pdfIn PDF document text
- https://okud-istra.hr/userfiles/file/42342169718.pdfIn PDF document text
- http://rockycheng.com/ckfinder/userfiles/files/zogevutasetatomexirenope.pdfIn PDF document text
- http://hotelborgodeipoeti.com/userfiles/files/90846251404.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/h891aqiee1v0jp09113l46pca7/lavevexurizuso.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2855da20---kidisak.pdfIn PDF document text
- http://restavratorstvo.com/ckfinder/userfiles/files/84587041951.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/85328378954.pdfIn PDF document text
- http://taskentcompany.com/userfiles/file/48168561257.pdfIn PDF document text
- http://www.startservis.sk/novy/ckfinder/userfiles/files/61293895445.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_off0000b3e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cbf7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBF7	10672 bytes
SHA-256: `0e3675c580fba28034f4b0e627557fb89d6a3524ee7ca1dae44c43c188266839`
`font_02_sfnt_off0000e434.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE434	14452 bytes
SHA-256: `86cff37ca0bfdfc9a4de7bee87596d6b4738d1f5ba6d7d3312b2d53b0728724a`

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