Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4628965310c182…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 08:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbb6b09532daba42fc9fadd2d4a4777e SHA-1: a79fc6c59f8f071e452c619039d175878a19bef9 SHA-256: 3b4628965310c182415f2e05f442df96b12b0ea32c86a10768f323384d2fc1ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised infrastructure, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farm heuristics supports the classification as a malicious document.

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 http://studioingtassinari.eu/userfiles/files/rasosakevateje.pdf In PDF document text
    • http://infosierra.es/images/editor/71406957368.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wemipamolevaxexe.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/46466985475.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/vonolinekut.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/47245434928.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/sidifivilugudupo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/40836058505.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/80162997813.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/19681477015.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9df776a5---viwiponoj.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a110c5d7c847da898dda6f072684316a/mevegorogibiselupu.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/mumavozugiwodor.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gokimuwuxedilema.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/84760700698.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc8060b8a---mewiwepative.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c89c953af86c55a40f6b23a3816b2171/60988857511.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3e542c13a9078a9aed9d535c46576606/kazafalefejafoxi.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/fitagamaderovazo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85b91160a---lotiwi.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/77417533780.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/80388799226.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109170216234372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80d17ebd---megomugovoju.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29571552717.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/wumetasonob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=current+earn+cash+mod+apkPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17604 bytes
SHA-256: ccffd46081e7e2f510a4674eb74d547ab01abeefc14b6f86bbb67a8e6f15351a
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 10864 bytes
SHA-256: 8ad99db6721807dea4b07f0b40aae662e2b212e49d800c4c5d69b6bbe3cc1ca0

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