Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff683c23b790569…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 06:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 823e0d25d3532087e862d373dd3e39ec SHA-1: c3bc64d2a686056d2d6d6b803327a8353608c80b SHA-256: 7ff683c23b7905693086ae9132e95dcc5b5b7a40eda6682a797c63d7f13d1d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of external URIs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stagelight.pl/userfiles/files/55855477049.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/le98671rqnc02erfbf6otrb54t/kavuret.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/26995447216.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/41264312441.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108e82091d20---sefasanomizamagusilove.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/fpt7btaneh6m91kcuprbctaqv1/pajadanasonimoxugajig.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d216165---67036616214.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/2023179213.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/3622505183.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/38775710235.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fupudasomegokivuxiwidid.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/84b0d9406bf9abd7a6c18dbc25bf79f3/35173143483.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qpfj56ipj6j3rns8qcf1ie6jno/60387179211.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1d517c5c---wiwuxudafajib.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/tepuwilojuras.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1b306f03cce5962ab2e4614a0b09fccd/gewafexog.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/bujodepodewuzag.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/15172840464.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/50685946307.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/91418574167.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/51605079239.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/lerujarotetabupunep.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa2d5507d---nogomasufepesin.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/pepexituduwimebanaposi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xotirarebamivuter.pdfIn PDF document text
    • https://parc-hotel.info/file/1333876087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=quiccan+andrew+york+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.

FilenameKindSourceSize
font_00_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 19676 bytes
SHA-256: 7fe6c07104371ec7f537423a2f584deda8f79d1e44670d952084f0cc77ef1ba0
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10752 bytes
SHA-256: c806ecbdfb2387104ec0883cf51ea5db07fc40e1f6007be0c3113a2f1db6ecdf
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1