PDF malware analysis — malicious · dffe471647bf1988

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 00:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a67f09111737a29d25da799469d0ae39 SHA-1: 1fe33ebd694e55a230ab50eab0c125596d3318a2 SHA-256: dffe471647bf1988231d151b0f460cbf79661a71c7500e838837589cd96c78d0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm or phishing lure. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=gta+5+mobile+on+android', attempts to trick users into downloading a fake game, likely leading to malware or credential theft.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=gta+5+mobile+on+android PDF link annotation
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2036dd36---39106515795.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ifc3e74qmfnhbfaifbf2f350v2/xabagopatekumivopu.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02d0e23a5---27604375096.pdfIn PDF document text
- http://quatanggiabao.com/images/uploads/files/lovalupumumojokat.pdfIn PDF document text
- http://interwork.sk/userfiles/file/57470109551.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e3b4d6a1ebb91e19d8beedadd28f5e33/zepefux.pdfIn PDF document text
- https://arket.io/wp-content/plugins/super-forms/uploads/php/files/svfccl0qa1sstq0o0121ppcf32/kejulovoxizedof.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/52055473402.pdfIn PDF document text
- http://jarosi.hu/files/file/vovelixoxuvapuzu.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a542b185b0f---joputejinul.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af4a3c2f9---vakifamojuwidupexi.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18a96d06c---xodokixuli.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a68c46934---49733797039.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7abf867dd---jetupitijumokenitubafovoz.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/88ktkge6fbm8kpv0irnrr80d73/79396639703.pdfIn PDF document text
- http://busanpc1.com/upload/fckeditor/file/97357611438.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8f9643d6dc27f7e9e848e493d93bdea8/82408578105.pdfIn PDF document text
- http://sotel-perm.ru/site/file/nenagajelomuvuvilib.pdfIn PDF document text
- http://moristas.com/userfiles/files/nokonoturebipuxobor.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdac9b54ab---wewexikupuweronugita.pdfIn PDF document text
- http://evergladesharvesting.com/ckfinder/userfiles/files/wugajuvudujudaberuvadu.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9lbgepa8ae3h8tk836o3jn9al9/xosuduwifotamaku.pdfIn PDF document text
- http://penzionklara.cz/userfiles/file/60863362553.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c196643c7c---35923103403.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_off0000e731.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE731	10552 bytes
SHA-256: `01fa611f9105178281e88670331ea9fc04f02606dc60eda54046e42206103fbb`
`font_01_sfnt_off0000ff42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011754.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11754	17276 bytes
SHA-256: `da8c94a1b6e5bee9ddc92ba2c805b50bb6b177ee554b5d2bfaeaca238d3c038f`

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