Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53730db84146990…

MALICIOUS

PDF

83.0 KB Created: 2021-06-18 09:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d2dae2471327bb3bcccfb31edbab2af2 SHA-1: 4fce4868cedfc2a13562e691050872dba7b58013 SHA-256: b53730db84146990bf69faf8a533bc709247a13f60f677ae9c6d5b18bab4bd76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript 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, directing users to download potentially malicious files from compromised websites, disguised as a lure for 'free fire all skins unlocked mod apk'. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/kan5u7fqp9bobrf9febio3qdtl/63684189784.pdf In PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/famixipufomolox.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0718253b327e67a1c9f45f7abd66ab52/dujimabomipovepimuzadi.pdfIn PDF document text
    • https://cooperspick.com/files/murok.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee6cb96a42df997d96bde6ab96122b8c/58711247520.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d79bfef1---zakuga.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511202126627752.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2899c09f---6437432201.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/betudonidaj.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/44ebbe6f28a39f9e1e8b210594e56771/kidusaledekomaxemidomemi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bagombhcucq3c3rur20hvsp622/56100887170.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/dupuloponesiv.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vuvixaferegabofenarovik.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/12648080022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+all+skins+unlocked+mod+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 5320 bytes
SHA-256: ecbcc126e465aad705a0ba410c540d97ffea22cb890ab24b88881ecf60c37d50
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 11540 bytes
SHA-256: 49ec6ec85ddd391e56febbc0eb0b44c22662cf24136ce5c4224e7453bf10dcac