Malicious PDF — malware analysis report

Static analysis result for SHA-256 561ab2fd6ad0a4eb…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5684692df2051a3239acdb80b0bcbff3 SHA-1: 6a4b874b72b94f75b8fe47916dd62726a92af984 SHA-256: 561ab2fd6ad0a4ebe81d087e16f657a09bfc7cbafe10fc9228f595e2d5002b71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, a common tactic to distribute malicious payloads while evading initial detection. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, further obscuring the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427b2e3128---64346204630.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7226f3a35d---timegerutel.pdf
    • http://helder-effect.nl/userfiles/file/fozujatefinolekoseliguw.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8695f4031---vitokoferovefu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30815c636---renamobukopukumerupejufi.pdf
    • http://sistersaviopublicschool.com/userfiles/file/44485270019.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26d4273ea92eedb4e8841e775224be43/93939293421.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2259b82ed8902454834a0853bee3c85/dixixokumuforaza.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c473f12f5a---66172482451.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b64947a92---tigolixizobobexetet.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/k7nast6jiigjnoi68npf39gba8/81815638476.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/xulorasebuw.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e2260b19---27923392774.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e3ea9c79330a143f9d083220f75615c2/40097150254.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed3444d5e---80171646057.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r802gjen3og1bfehncclqagil9/nesetupisinit.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/65te8ehvl1rogf96degetrii7q/22371579938.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba324dd5d65---72424516217.pdf
    • http://sugarfree-gelato.com/upload/file/24145439392.pdf
    • https://xlspandoek.nl/userfiles/file/xilijibolikepobiforux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=acer+desktop+default+bios+password
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73c.bin
65cded92825e640f44a448be0c301152943008204ffc0c64e8ab242d203be3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 17364 bytes
font_01_sfnt_off000124ea.bin
cd169e811a4030c4858ad803429238295d3aee70410ec87eef65f85991c3d670
pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 10908 bytes
font_02_sfnt_off00013e2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 16792 bytes