PDF malware analysis — malicious · c6692e46b694bd4c

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 00:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9aeba1c137c0065cfc6862fcac94ca49 SHA-1: f9226fb113172aae3c73b7b19f3f7d554d513849 SHA-256: c6692e46b694bd4c397a5c015e4e8f933afece4b44cf32199f3da98a65a062c8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, leveraging compromised infrastructure to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/572fp8b8thtbh513bf1o9t81sc/rifaxikugopifaz.pdf In PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed69dc4fe---20315812727.pdfIn PDF document text
- http://kasystemofkarate.com/clients/861259/File/zanavuzad.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/kemamal.pdfIn PDF document text
- http://ap116.ru/userfiles/file/kaxesijamu.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609612cbd2c3b---lowefagerepizuwi.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c0388f632---73223426684.pdfIn PDF document text
- http://stlnsk.ru/uploads/file/finijitozitol.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6bdd24837---kewefawajagizutenemajipab.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/vibegebipafop.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/9cf1t7oalenh026v3dllvtd9s1/94906869224.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/panijonitiwipukiwuxagixax.pdfIn PDF document text
- http://digilit.ir/basefile/digilitir/files/nasakatumukivegesifaweram.pdfIn PDF document text
- https://mauspro.net/upload/files/wurozuvexafiwowekumezep.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982dbd6398b---rijapuru.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072308d4c449---37485336211.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0b503ca8c8b1528ddb48e8c7de8ed162/jusuta.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b5ac39fa8acaae2c16fb3e5cd5d58740/2906959163.pdfIn PDF document text
- http://rolmech-strzelno.pl/Upload/file/15167239474.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b36ccad3dc425ccb73f1e573b95865bb/vulajawaduzal.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609441a0b8327---66281008696.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d508af57---welanazefugesu.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b85acaeff118bb88d279851227b93c1/4825125305.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d30e7ca6---wisumaxudijeb.pdfIn PDF document text
- http://koutingchina.com/upload/files/lumuniwewopozegije.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/95627336099.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=questions+and+answers+on+employer+shared+responsibilityPDF 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_off0000f32c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32C	11156 bytes
SHA-256: `d7608d8cefc3a0c9944ec229185a5465338b0ea3e65246c49abd1bc5ecd1c80c`
`font_01_sfnt_off00010cfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CFA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001250c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1250C	17844 bytes
SHA-256: `6297b21b5af04fb493d880111aee6c0f56050f9feddba69c6233fdc0ba34dcd6`

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