Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f5910084e6d340…

MALICIOUS

PDF

83.2 KB Created: 2021-10-10 04:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 47ac7544744135b01961e79f702a7560 SHA-1: 67d6afb753c36cfaa791aaabd7d627cb1d9ffba0 SHA-256: 77f5910084e6d340ba9dae380cc2c9803e54f96ce3ad125ba8e32434862d326a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a password-protected archive lure, a common tactic to bypass gateway security. The embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://terwaarde.be/ckfinder/userfiles/files/79832671375.pdf In PDF document text
    • https://europartner2.pl/uploads/refotodebonidekegitub.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/81882699687.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/xejorosejutejopasezog.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/bekoradujelij.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b3e04e59767ffeb9b37c4ddc47a8ea18/lamedozisadojasopunupiza.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/vukifosadubijuj.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bovopoxelaluzu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/rawazoganeg.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/piguwixarifagonamowoboti.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/980259007adeb459eb364365dc7c91dc/jowigujerapevutitimuluwe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ed8cef547---80968021447.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16152e2b27eda9---jifufe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/j6sh6k6660ps04m1eceghtcff0/58634614558.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21e94f8ba---tefanidexos.pdfIn PDF document text
    • http://twilaw.com/files/files/jetuwakabuzemitufoturepab.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/452d49578854fe7e11e7ea5f06fd91ec/pejuwojirinoxo.pdfIn PDF document text
    • http://school15-tyumen.ru/f/85335921999.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/xovekagelikosiwosujon.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zolifatalidolezoto.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/9603224634.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151432e7263f---fowafutolawokupibavot.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gozimazatinosemarebolose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+unban+a+player+in+minecraftPDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 18164 bytes
SHA-256: b845a90461daae37eb95f0fe407e101dfdd3c5bc4354ff314bb038d8d4878c6d
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 10904 bytes
SHA-256: 42f785088d8411b393f2b0243a42196ea26f43bf781876c826ef57323995639d
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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