PDF malware analysis — malicious · a0442b58287cb3c0

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 04:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 18ee5e6b7aa4f56ae67147eaba707737 SHA-1: 9c6331f346419b4173f9b76beb5bb58797c8341f SHA-256: a0442b58287cb3c0d5d5f8b598aa7db1f11dcef0c87c58c5289d0b6269701a06

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The presence of these links suggests an intent to lure users to malicious sites for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

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.
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 http://nagymester.com/userfiles/file/nubog.pdf In PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/2977278173.pdfIn PDF document text
- https://podgoricki-klub.me/userfiles/file/49897618187.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/tudovovepaw.pdfIn PDF document text
- http://uhorder.com/upload/files/58050155962.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/381f829b23fc16f081897454b9d471cb/56979967156.pdfIn PDF document text
- https://raiporjai.com/piceditor/file/rotorumitadukulujemixa.pdfIn PDF document text
- http://creatinglifeoptions.com/userfiles/files/96611980056.pdfIn PDF document text
- http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/dedetojitezu.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/d8fip5ujha9p2jg9k8gsns1n10/sezivazimojuwidosusuz.pdfIn PDF document text
- https://pokereshop.cz/data/file/gidarululozu.pdfIn PDF document text
- https://marblobaths.ph/app/webroot/img/files/87999740884.pdfIn PDF document text
- http://ristoranteyuri2.com/userfiles/file/tekog.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48b168bb5ff847a29d92fb1a6b599d3/sarakufozosigibig.pdfIn PDF document text
- https://mlbcsimleague.com/ckfinder/userfiles/files/83746221795.pdfIn PDF document text
- http://studiosiciliani.eu/userfiles/files/64568856970.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/77785c3dd14e6fd14a8c227e7723c2f8/52044945212.pdfIn PDF document text
- http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/7129304285.pdfIn PDF document text
- http://castel.lu/userfiles/files/sifasozukovut.pdfIn PDF document text
- http://asremajazi.com/uploads/files/rofovovowobapujonanuna.pdfIn PDF document text
- http://beming.com/ressource/site-image/files/37234108451.pdfIn PDF document text
- https://picinterior.com/ckfinder/userfiles/files/tesibaporetapo.pdfIn PDF document text
- http://avalon-essenzen.at/userfiles/file/41548839779.pdfIn PDF document text
- http://rioairporttransfer.com/ckfinder/userfiles/files/tozix.pdfIn PDF document text
- https://giriconsultancy.com/content_files/files/99289024330.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+app+download+apk+2020PDF link annotation
- 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_off0000e06c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE06C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f87e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF87E	17488 bytes
SHA-256: `866069ce7d4a6c4ee62831c213b70e13de9cfd6f717c9e08bae5e4308293e7fb`
`font_02_sfnt_off0001257c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1257C	10672 bytes
SHA-256: `e14505451352faecd68054fdba56a75d2929bd4687b4b03d264067b5a59cd4dc`

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