PDF malware analysis — malicious · 169f0a7a2930bd45

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 19:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2819c9753d0f0349d138c3f7172032e6 SHA-1: 2a1287ec5be1bb454418e6bcfe983050527eec40 SHA-256: 169f0a7a2930bd45a671cbf0e22f5ad61d3d93f0069c2cf5db5661e3240fa3ef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://mosallaesf.ir/uploads/ck/files/dakelipalinape.pdf In PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074527517621---gobotixo.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/as68i7iaq456q4skjbnap29ut8/34205158304.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9fa2qhir0jerakec9a3e3tsq47/jedubinukitidipunad.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ee8rn1omvo8374mfj48bfc769u/xatinira.pdfIn PDF document text
- http://kimdaiphatsteel.com/Images_upload/files/pafezemenafovuwufelexora.pdfIn PDF document text
- https://biocoils.com/img/file/boket.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/478e4c16c769f1ac53ac853e37cc5846/58486728478.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c4265622d34f9050c2e41c8a58157fa/53126951248.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/97813107272.pdfIn PDF document text
- http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/66643135747.pdfIn PDF document text
- https://ms01bet.com/contents//files/kobuvatajemujow.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uv6g2dbdl6q18f90bc66q8dnd9/9816801704.pdfIn PDF document text
- http://daearesort.com/FileData/ckfinder/files/20210802_BDBC93512E8BD8A5.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a8d85882783d752fa75dcb4b9e1d9011/7516733152.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf960a4d7a---fuzesufukareteneva.pdfIn PDF document text
- http://dagmar-e.de/userfiles/file/vejipi.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/dipasif.pdfIn PDF document text
- https://gerastar.com/userfiles/file/rajivubobinewabejolira.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bda8cdb9---pifagukabifo.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/banugazapaxajuworepibif.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/xijevarifowubewaf.pdfIn PDF document text
- http://amajyuku.com/files/files/gozinidoxomogelomunizazis.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19eef6ba08e8596e0486c2d4fb848682/21828432940.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0723bdfd5d---livasox.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hospital+infection+control+committee+pdfPDF 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_off0000ebfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBFD	10772 bytes
SHA-256: `e52ebab9a11d73072414fcd3584f5b92473f2257bbbff7eb4d5cb3de0b8e16d4`
`font_01_sfnt_off000104ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ccc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CCC	17496 bytes
SHA-256: `617a966db116c2ef3e9afb9526a32b3d53de801d8aa267b4f9d88e153cb84422`

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