Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77c1b66070163c9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 18:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9a81f8c77a2ef407733ab5429ead7b7 SHA-1: 5caccd15266107cf708d0f8fe0e5a1392ee38cff SHA-256: f77c1b66070163c9020df4507ee4360b2c9b2d3b2beb2bdc891f6b2c61159312
176 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cafemocion.com/userfiles/file/17475625800.pdf In PDF document text
    • https://farmacieitaliane.com/documenti/file/perujunowoborunuvatito.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/lamukepumo.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908123829.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zadedibakaw.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pokemitivuziz.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sevuxedilis.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zirupugato.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t8ua1aubhhr1bmuld6f440970u/pujoxivifugesedeta.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23036749981.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133e98b2727b---fubilejon.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/53862993152.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b7dce01f---18016195728.pdfIn PDF document text
    • https://onlinendttraining.net/files/56537417387.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/gigefes.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/53234073177.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/92777262562.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/48145650405.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51295820790.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/varawezifewalefet.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/zeponisok.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c168e655---sunisod.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/81892835585.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/72950356757.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/32443716771.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/94487724868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=samsung+soundbar+hw-ms550+manualPDF 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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 11064 bytes
SHA-256: 57659e7a127d785334167de03558dd226851dd1d2b6af4a1f750b0bd63ac0e21
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 17504 bytes
SHA-256: 7024842636e11a28e26970f078438bd33f9dcfcc50f6e5150b7de219801387a6