PDF malware analysis — malicious · d1a4be65bb5cf084

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 23:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f6c19dcde8ff07f99aeb7c650cf29f97 SHA-1: 23e5a8dfb9b7cc061ff3b47b97f9c61846c6da8b SHA-256: d1a4be65bb5cf084c1e762d66639662956dd9b3eb78394f47e7b59facc937be0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=biointensive+integrated+pest+management+pdf PDF link annotation
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c004c0aa1434527f642f4ab794ca1ce/womunosena.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0e2s9jiq901c90tko8toggcrp2/maxejijegidutazetapu.pdfIn PDF document text
- https://fleseriuassociates.ro/files/file/42116041680.pdfIn PDF document text
- http://cssh.es/img/file/tumumumazuxiwu.pdfIn PDF document text
- http://akinmedical.com/uploads/file/baxifupin.pdfIn PDF document text
- http://annandale1963.com/clients/69704/File/67581122770.pdfIn PDF document text
- http://vzwsportenmuziek.com/content_docs/bozurofemowapiguruwiv.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7ad6de88---18934388067.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d02114a4789---38936536904.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921c7378223---39428097519.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ad18a47ee768402cb600678caa1fde1f/44211688765.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/pezanekulox.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4b654897d9f3ea639599fc852d16ee07/jajenip.pdfIn PDF document text
- http://studio-castiglioni.com/userfiles/files/80197018763.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8e42e1ba---tewova.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa84f1ee5a---80183142572.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160754471d6138---47474095675.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610535ed622eb---18994098933.pdfIn PDF document text
- https://ibeguiristain.com/userfiles/files/90959651434.pdfIn PDF document text
- http://abc-tel.ru/data/File/76410200166.pdfIn PDF document text
- http://hornets88.com/clients/56662/File/walasufad.pdfIn PDF document text
- https://www.dgaspcsm.ro/ckfinder/userfiles/files/40397470769.pdfIn PDF document text
- https://balajihighfields.in/userfiles/file/pusij.pdfIn PDF document text
- http://ttmplus.com/userfiles/files/85166458769.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e7d5cdd90967d159bd3786b7762edd00/tumogopisiganirujibij.pdfIn PDF document text
- https://corianderedmonton.com/ckfinder/userfiles/files/xivilitavuwaj.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_off0000dda1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDA1	10912 bytes
SHA-256: `3c46f433d6536e1543303d8837ac19a067eae6463311d1abe72da6b0e0cb18bd`
`font_01_sfnt_off0000f6c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ed4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ED4	18508 bytes
SHA-256: `20325b707b3c5b27b4b7a480ec199b51c7314cbabedd87b28469718dba500f22`

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