PDF malware analysis — malicious · f30cba63d7de4797

MALICIOUS

PDF

133.7 KB Created: 2021-06-28 02:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 444538d71415e76d39c1d6b8903c2238 SHA-1: 908f042360bf31f51bad2dd246051f75f6235364 SHA-256: f30cba63d7de47978572a80087df4629008f2b4a1695a0a58ff33e16fbbf4447

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary attack pattern is likely spearphishing attachment, with the embedded links serving as a lure to potentially malicious content or further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9611

Heuristics 5

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://catamma.ru/uplcv?utm_term=sql+2012+download+iso PDF link annotation
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701879f279---90721731428.pdfIn PDF document text
- http://dashoernerboot.de/userfiles/mawojuzegedokokosidasomud.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f98a5fa58---42684191047.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d9f4a277---95598862719.pdfIn PDF document text
- https://legouic-peinture.fr/userfiles/file/navatamesaxefudolifiv.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/73840552270.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/uej72gsue11vnb4bbqgk7bg0h7/mexedopelanigobotomowap.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e617cd3eef88d40c78accb298a607fb5/93682065352.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/929d02f6eacc56fb8215aae635aaa27d/konefixujegojiliwepape.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd00befd---pagisufa.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb61b6e27---juvosuditajuvevur.pdfIn PDF document text
- https://soalmatematik.com/userfiles/file/logiwodapunafajudogopa.pdfIn PDF document text
- http://studiotecnicomaglio.it/userfiles/files/18081359256.pdfIn PDF document text
- https://securitydm.com/slicice/file/1201517834.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/rajosojonisom.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902546e5b62---pojabewofefagujedosive.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/81d3a2fce9b51d29e15549ee024567fa/suxupuwisarusimeram.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/vorabuderonibomafemaro.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/65361eb670f29e11a4bd5e7509d4b039/joterafo.pdfIn PDF document text
- http://loveperfectionschool.com/upload/file/79958419642.pdfIn PDF document text
- https://alarrabnews.com/images/content/content/file/gefuvan.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f05af7ba0091eac3a9201b3c221136b1/liwikarupojubape.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991365490b7---51229505506.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef18a2efc2---fizofetokumivumisesepuno.pdfIn PDF document text
- http://amuseonline.com/absite/userfiles/file/71560945358.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ro3b8lri58vgo3s2qvje7ret74/54310982450.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/smf92q3196falbqormfim6g3r6/34251352456.pdfIn PDF document text
- http://www.deep2001.com/images/library/File/sisanukamisoti.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_off0001a60d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A60D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001be24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BE24	10512 bytes
SHA-256: `209ff9be821658e681776d718a571bb86ebc322064819db9e2a57a9a03c0d300`
`font_02_sfnt_off0001d607.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D607	19592 bytes
SHA-256: `f594b05a5d96ff746784f3127b06dd892cecdd9234159dcdd9dcdcaff80d1927`

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