PDF malware analysis — malicious · 6aa99adf18fbed0b

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 15:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: cda588c34df135cf86b9b787b0ec8bab SHA-1: 72621cb41f5e44ce79acdeb94ff708db74f76b85 SHA-256: 6aa99adf18fbed0b0b681f0be863ccaeeecf7be635ba8251b38e081ce7387dff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to disposable or compromised domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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 http://progfin.pl/userfiles/file/nogusiwapepovipudis.pdf In PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cr133sbue848hm9q7senqfrfn4/41850711250.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/96431420798.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/886055e1d4c4efc899e795c25984b018/7464730004.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f5b3e7fbfbd4054f21cdc075f8d47977/palapalixow.pdfIn PDF document text
- https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/9154489522.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/58108475756.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d399d8a9364---lokefad.pdfIn PDF document text
- http://89928386.com/uploads/files/202108242257435673.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/45f296dfdb62342dca395c1cd37bf380/zidomevozenole.pdfIn PDF document text
- http://alrabbancapital.com/file/files/bogelomotujupagamaxekated.pdfIn PDF document text
- http://comp-art.ru/userfiles/file/fajoxo.pdfIn PDF document text
- https://finatwork.com/userfiles/file/93274835310.pdfIn PDF document text
- https://geneolock.com/locktactyuma/userfiles/file/segejifetuzunowakolureva.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a3dac9771422f834c867033778c9b8e3/vewisakopimifebanidejivib.pdfIn PDF document text
- http://artin-intranet.com/ckupload/files/lilexov.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ecaf42c00---35551090571.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ihmfnaf11s5b1lubrjbcq7utl0/ruregidajofavuwam.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992dc6638e4---pedode.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/814f2c540e4d585530ff0785e0587461/16690464111.pdfIn PDF document text
- http://dieterheich.de/images/uploads/file/zidijabukomi.pdfIn PDF document text
- https://fullmagicweekend.com/ckfinder/userfiles/files/zizulenoka.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ede9198c---xofetoboxitigimatazupaxo.pdfIn PDF document text
- http://change4best.ru/upload/file/37819997250.pdfIn PDF document text
- http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xebirigadixilamejewudibiv.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/963ae1l7m6gen77evmarb093h4/duxesif.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lcpdfr+key+commandsPDF 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_off0000e83e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83E	10708 bytes
SHA-256: `091bfb7ae3289bb697949acf473a1a7e053c89b9962937424aa1bbc978e1c236`
`font_01_sfnt_off000100d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100D3	18076 bytes
SHA-256: `3b774746f8937b6d50a1b943096ba4f15f584fed2967ca2830c0e2672fa6f004`
`font_02_sfnt_off00012f5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F5E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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