PDF malware analysis — malicious · 23d1815b77cd0796

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 10:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 03db7881992064a4fc01a010aaa2fd89 SHA-1: f16a3cb41abc304544b33657ffd59aa5ae3a68f3 SHA-256: 23d1815b77cd0796855f7fac38ad92e7234a903ab99c6c0e72ce698e072e2192

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9e5a905444ab46a8f180d031c7779839/korimaxejet.pdf In PDF document text
- http://aven.su/userfiles/file/45508128181.pdfIn PDF document text
- https://hsse.cl/files/83518032013.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/52363850892.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/80436618706.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/waxuwajejifiwirikidak.pdfIn PDF document text
- http://roleco.pl/data/aktualnosci_imgs/file/zirufepupuvoju.pdfIn PDF document text
- https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/4176010150.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160867a9b566f2---xofiwisufufadikuxovuwuseb.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/84596776725.pdfIn PDF document text
- http://9meclinic.com/ckfinder/userfiles/files/bajabebezetuz.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cc7ec832c60287ec0e775570612dde98/sirunipesixu.pdfIn PDF document text
- http://peneleos.pl/userfiles/file/pajoluxabifekopegusonepup.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7160c7d55---maludodatolorikejibepil.pdfIn PDF document text
- http://ortopediaszombathely.hu/editor_up/7431397408.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d5756a0be57035feba71f6b4591fad38/38313371995.pdfIn PDF document text
- http://abwmechanicsville.com/uploads/files/14373824462.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bklqub3ck3eltgslqhquktt043/takokap.pdfIn PDF document text
- http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/jekovup.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/91077780432.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607651c81ab75---63804769755.pdfIn PDF document text
- https://aaaxxion.info/images/file/45166802152.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f1cf7898d05fdedc5e0f90183a593539/ginevuwot.pdfIn PDF document text
- http://annassteen.com/ckfinder/userfiles/files/29346779250.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=heterocyclic+compounds+classification+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_off0000b929.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB929	10984 bytes
SHA-256: `0dbff1e3e42e8bc2a28f2cc90913020d4ed928c900d2b99a349d920fdbcc20b1`
`font_01_sfnt_off0000d2a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eab3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAB3	14532 bytes
SHA-256: `8dfb6ac32eae0faccd559729c87b0181b4b061caa052d58287c7f576cac9aa0a`

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