PDF malware analysis — malicious · 719d71a3876095ce

MALICIOUS

PDF

85.0 KB Created: 2021-07-15 20:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c0688463ea736b5f8b4fcc8bfad0660f SHA-1: 4ed38483c01c8498002ca60811e7e77cc77be7f8 SHA-256: 719d71a3876095ce86316f646fdbdf8a9a7fa2f5c7b4081f84706a5e7cea80f2

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9834

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 https://crysiq.ru/uplcv?utm_term=roasted+red+potatoes+and+carrots PDF link annotation
- http://hrt-foto.hu/_user/file/30765443183.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160743049e7fed---vodevinepe.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e0d1d53a309549bb58b3b9266c3590e9/riritubawawinoxebakuvid.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b27da791860---jizirewaxagogovat.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ad5b86026b66beb11a017a2684808792/70845311137.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c944464d7---vadadeberumutupog.pdfIn PDF document text
- http://loaamtran.com/files/usersfiles/files/1083670653.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe649e271---toxupubixaramirusezale.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/93753886741.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7edlh5j21eflo4l1ofhbqvtmgb/93981367717.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/95c52142be8d85ee4dea211562ca2b4c/58322590553.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tq9h5pdn0tnipo9bn775kvopl9/89166744474.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa246a11f43---61314923518.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b04774356dac306ec7c35de806d2614d/dabupaxof.pdfIn PDF document text
- http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/vovokewagisimopugabomavot.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df4162b83---82749032782.pdfIn PDF document text
- http://10glazsikeyrosa.ru/file/57172301615.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608908170a3f3---bediranaso.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/nomefa.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c36f7492008---wataxivejiriguse.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2deb6e84d---tojuviminenuvujosunoz.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b95e6600bef---nibemopumuxiruneneb.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbf2eb94b---gugarenazubebozapuboj.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797ee8965c---lijobod.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/perefisukozalelob.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mibanugidok.pdfIn PDF document text
- http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/kegorusiviraxudina.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_off0000eadd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEADD	10412 bytes
SHA-256: `c9e433c8cfffcfc7efee617eb7aa1a0832336883a672fff9db224b77bb2a23d3`
`font_01_sfnt_off0001029b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1029B	16376 bytes
SHA-256: `6b4304361aaf0538e2845ba33c035d28d88054c82d62a9f24bf0c77de05f27ff`
`font_02_sfnt_off00012cac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CAC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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