Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf287e356d46f97f…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 16:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e4ac914eca222d0d29b3d3bd0d6feba SHA-1: 130747331be009923df7f5b9ad319e49cab1c554 SHA-256: bf287e356d46f97f4660639851eb7c4d406b68e5c64a646620ef1d56b4ce3c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage, likely intended to redirect users to phishing or malware distribution sites. The presence of numerous external URIs and link farms suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://crysiq.ru/uplcv?utm_term=what%27s+the+answer+to+a+subtraction+problem PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ef498131b45d45f2aef57341619e589e/wugovimibiger.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48986c75f---webifomab.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df06832ea---juwoberorunizifozovo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/linozibol.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/ribiwefalitugiwokeze.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6ac8af48f1e0e26357c4f09df590bb66/bipolimenururadu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4fba40d94b1b409f94f0a0622c2a01c7/59258221167.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a7a0ca08---deberorubexowetugu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/917f5fa0c6ba43fadd33fa977d6367e5/nusevuxipatopusosibu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba838c5c4a8---naxobugire.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b0568ad7495---dosagikokowapotazujeluzu.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/mazibemumasoxav.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/nitibolojajiwize.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/5826018938.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bb12386d---77348017424.pdfIn PDF document text
    • http://jarosi.hu/files/file/sarixitefaxaj.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d8k13lb6rrj8ckniatr8s0q053/pelimupokaveruf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb246c6---2495148308.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/63fb94a2776050a724cc1aac74099ad6/97654629442.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/tupalu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/k9f4dbtffhsmht2drgu0e3gdbc/kemoxuxoluxetexu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/55510de132811eb2f2a6807c59d0c7d4/20900424098.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/tukuvu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10992 bytes
SHA-256: 134facff128d259cef0421fd9eb77bed70602a990555348106169cda382038fc
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 17004 bytes
SHA-256: f68e79a81724347ef462c670ac824d727d26c1ae3266a954c650b50d2f480faa
font_03_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 17248 bytes
SHA-256: 575e180b706dcdc741124aea51b3eb34fab89e3b97383acf10938e33c27600fa

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