PDF malware analysis — malicious · b7c4e451781af6b9

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 13:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e8173f133268a170d22a7e17810e86ec SHA-1: 9695170fc5263b2a3c7593cb0299f1798e9e2cb1 SHA-256: b7c4e451781af6b9fd2d92e78375bbf583139eb45ada520a5f15dd4a47be087d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised content management systems or disposable domains. The presence of numerous links and the use of compromised hosting suggest an attempt to distribute phishing content or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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 https://garglob.ru/uplcv?utm_term=famous+melungeon+people PDF link annotation
- https://a2designbg.com/userfiles/file/34951593315.pdfIn PDF document text
- http://lungshingcentre.com/userfiles/54002221154.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1bc25d8---82961203076.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc0bc2829---44113851730.pdfIn PDF document text
- https://wecareu.net/ckfinder/userfiles/files/33564911243.pdfIn PDF document text
- https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/abf9347eb450526566e73f98dad8390c/nabekokujazoseguxi.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/75935924365.pdfIn PDF document text
- https://renebeumer.nl/userfiles/file/98219517517.pdfIn PDF document text
- https://promise-land.com/upload/file/25998828786.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cae996b30b8---xonujividawabozu.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37d06185e---76649314544.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/68410854760bf692a61b24.pdfIn PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a589715d4f1bc77225e5eef67d9c9caa/22394211667.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a848de0b---katojobirum.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/noi9avrje04o66acae9bgekk2u/xasaladajopixexug.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d223942c18---dulerutomesavotap.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf5a51ff96---56755075065.pdfIn PDF document text
- http://zonweringnederland.com/ckfinder/userfiles/files/745705649.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/zapozosatanaxakumarofude.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839c7b77222---gemusowitokopuwexugavirek.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/neloge.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/mapavuwugad.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e18bdf208---48567960184.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b12c594b6---24167276414.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefateterojenezile.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3e73ed24e870321c3cf5f3e5cfeb250a/fufevo.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3790d15b7a---61093722536.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_off0000f712.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF712	17032 bytes
SHA-256: `3f7807c455ced5cfad1014909720c55e6c3ee7acfcfbd32e0393065a9f8003fa`
`font_01_sfnt_off0001236c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1236C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013b83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B83	10380 bytes
SHA-256: `cade06f4edebc7561ef3c88f3598cdb64f64a05342fa2b143980078e70096370`

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