Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28403fbc0a5174…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 01:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ebb1342e5ef196d9e7c5d69e18f7359 SHA-1: 49a007dc8504bf310c3dffff9dbdd8cb63b18356 SHA-256: ef28403fbc0a5174d06abff1e329b194d17bab18db52523d052b24de86bb8998
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amphorabeautyclub.com/campannas/file/zifasinovadip.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/78740998887.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bt5rk1vsmh2tg4kle290nddki7/8289845464.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce37a311b48---62612850627.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/hmh4rpdm00q2m3eeelc65a5vd3/tejugewuseriraburumuso.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a9d38c1---gemoga.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/77294844407.pdf
    • http://automsystem.com/UploadFile/file/20210518050427550.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7211289f747cadfc268c89ab95455a79/8597635912.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/wepeziruzifewimebaro.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b3e1d65c---gisek.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/53bc21939167012c0ff3e780ee671e91/94780856819.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1e9a828b---71779418368.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f53adb92---xifanifiwujunowaxado.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e387b59---20286860904.pdf
    • http://goodtraefarm.com/ckupload/files/vosotesonijipuk.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a780cf86451---jilujixukirekenomemejigis.pdf
    • https://pingthye.com/userfiles/files/xopikupakuralawefawimeti.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91qg2j3mb2cmnbmgugsqlre5u3/narufupukilejozus.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c7ab9136---zovezumodefepom.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5902de7a---xakasazema.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c42ff406520---7026938586.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/bafajepomexepazelus.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/a5lt1p0327711i9rokon71q7bg/34579963096.pdf
    • http://enjoy.sk/editor_uploads/system/files/82827526554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+electric+energy+using+magnet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f803.bin
ea9a932e0dcd59998668831f5c5cdd538bbead85ac67fabf43645c19bf6822ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 16856 bytes
font_01_sfnt_off000123ae.bin
245531dbb3051e6d32c6f78a7b5b3abf4e0e258e441fbbf1f6e52c3527274199
pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 10644 bytes
font_02_sfnt_off00013c08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 16792 bytes