Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0984f60f3eabfc…

MALICIOUS

PDF

171.9 KB Created: 2021-07-02 12:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72fbc0160819a2688858694b1997e2e4 SHA-1: 2bca036915368ca2d5b32dbb67870083cf921690 SHA-256: 4c0984f60f3eabfc4604e77117fe7bf0929c579b496e863b360e23fe378fc5d6
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, including compromised CMS upload directories. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, which could lead to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/713d2846f356ee6dc96d718ac1357954/xutevola.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9b1978a44db1a1412f053c9098408235/73995280041.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210530_6A5AB3D32EAC7916.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/62034477041.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/iejtr27t9i4ihfj10kiq4sgnn7/48699873700.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b835b03392c---matid.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e088dd474470bf60bdaa9d921568d137/gawivumumezupusiw.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/36161575965.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb4401807cf96a04cfd84a8d095315d9/ralurututedepozipifugule.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f18313e655fef0fd9ec95ae6609397ba/veruwatovasebeluxizegu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088f092b2c3e---63155101802.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608745365b465---85708724155.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51944c3fd9863a0d4ea92dec05f05d2f/60200837347.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd48b7824---nuzogoliputasofis.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54cf817af9f9c6a86a156310678fb74b/17759495111.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mukesixirawabafopolele.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/44431d5319e57fc919c76590d980db89/tavenaw.pdfIn PDF document text
    • https://puntoagricoltura.it/file/lumaminegaxitatetodij.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95d4e76462df1d41e5b013485ad18783/fozekiw.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160826ec0bbcaa---xejejebetirurajaputibak.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/64909532623.pdfIn PDF document text
    • http://amdind.com/userfiles/file/76006469528.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/fegafubeb.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/53446640062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sexual+reproduction+in+zygomycetesPDF 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_off00023c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C65 11308 bytes
SHA-256: b0a045fbd0524401114c3caa635dc589f30832ffa50331719cfa590c2f732700
font_01_sfnt_off000256c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256C2 19664 bytes
SHA-256: b6b538c1a58144e9f928f63c1246e496ce4f4835e26131ea7199181fb71e8bad
font_02_sfnt_off0002898e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2898E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1