PDF malware analysis — malicious · 6c04a32cd914a71f

MALICIOUS

PDF

84.2 KB Created: 2021-08-09 17:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ca1169272d08dd1793b5444de2a90d57 SHA-1: a6332d0e6a1834a1c9a78a6354fe773e87ac7fdb SHA-256: 6c04a32cd914a71feaf6bf869ffac74ec4bd2d4c8e5a9101ba11c7f4da48ba72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077335a3470f---towulugorijenofufow.pdf In PDF document text
- http://myjobcareer.net/userfiles/file/2021062609124473499.pdfIn PDF document text
- http://jlm-kg.com/uploads/file/ledurur.pdfIn PDF document text
- https://bd-sokolovska.eu/userfiles/file/77491742654.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911f199f338---77555062780.pdfIn PDF document text
- http://natpuedu.in/userfiles/file/sajexapanikexu.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10e110aad---xinifajolugasewos.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/732565df650bbb1957422d3192c014e3/35370385227.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/47685139cb928237aec0f4c28b20353d/jowugadizokamo.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/kilabem.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/35735a3a5151fb869d1e18bca4642e11/korilan.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be701cc5dc---tiwegotulita.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/40894373099.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8c6d35e3bc5276c770a63299cfe21b5e/lanilaxagonudorekuwolisaj.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vv76ioq6ghb3nvacmuhgvg0siq/zamiru.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/go1qjspdn61k77aak8ka9sv78g/75241769157.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1c805ff5---84249734832.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82ed279a7---nuzevokujajogidaxinino.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/86036230598.pdfIn PDF document text
- https://zoorichi.com/temp/fckeditor/file/kuzikozovopafax.pdfIn PDF document text
- http://ranch.pl/files/file/33977144990.pdfIn PDF document text
- http://bestbuyfromindia.com/userfiles/file/fulibisaf.pdfIn PDF document text
- https://sensiblemachines.com/ckfinder/core/connector/php/files/89952395374.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703af4d7e4d---71827190290.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/kurujumer.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=libros+de+fisica+i+para+bachillerato+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_off0000e1fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1FC	18008 bytes
SHA-256: `34bf87734b2a1780f11a8170e46bd0f578cb6575c5c80f60daf6069b5ade7aee`
`font_01_sfnt_off00010f98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F98	10708 bytes
SHA-256: `26bb95f12bef8d90c0bdfc6cc4264566ef79c80bf0db1bfeac01c3228d580161`
`font_02_sfnt_off00012814.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12814	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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