Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf5ee6a64c02590…

MALICIOUS

PDF

97.6 KB Created: 2021-06-30 08:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 317f8354b69769893f78df2c2de49e3b SHA-1: b805d3daf437e9e8de976dc9d5496af1691ffdda SHA-256: 1cf5ee6a64c0259010364a87c9aeb3cf511fab1070efe3839a0197fb6aeb3b01
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=music+question+answer PDF link annotation
    • http://acpiindia.com/userfiles/file/25424672104.pdfIn PDF document text
    • https://ivanamihic.com//files/wowiwetamojapusuje.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hsruc1jdurdb7ghab3qsrlpoqj/jiwuvapirosegawajidako.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lagutatosopadaziriziso.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/13569748997.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1780a10613---bodegutenalibimuxufuboved.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904831083---33707023078.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/sutakiduxubiwanitefisubej.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ravevexegu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zemediridesup.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/62b5dfbd203bf91775a8e26c5955fd12/sevuzonos.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e243d50e99ec569b563c873792b17c30/83374730319.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/setatidikupenaras.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fujuno.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0eb960e38---nelaworibezugabuliz.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/59987450999.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/78e94e2e9c543821a3842c9be7db664f/56461436478.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b1e4be6a86a5b370cb21a379189b7694/28501346888.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af990b3914---3416427100.pdfPDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd9a815f6---79560002775.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bede5b10b0e---69531557342.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1948fa73---jopipuxakepokufe.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdfIn PDF document text
    • http://slsnn.ru/content/file/36519049244.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93c3a5c891---xegudaxura.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/20530934879.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086924578007---kobezivasa.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/14230685870.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 10500 bytes
SHA-256: efde710c1f010c7f47b54f01084567c70bb64d3d383264defa22271fc486be5e
font_01_sfnt_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 18160 bytes
SHA-256: 5f3474559245c8a027d7c9ba301dfee7ada00f3746e67dfa4ac70c4b8e65cfa9

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