Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1fda7df68bb5b1…

MALICIOUS

PDF

85.8 KB Created: 2021-08-01 04:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0638e6deeaa85fb8096db1a71d470e5c SHA-1: 834787dafe1bdfe89665855419b74e9c80302a91 SHA-256: 4c1fda7df68bb5b1975b38a39e3237b35b06880def2a7bcdde6ce3de30ebbe82
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous links. The links point to a mix of compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3461

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v77qj5jigb53nbj4tmvqhv2nh2/talafasesigikakiwexasi.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b449daa909fd8f0b04948fea42af82d1/ruzanimuleze.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/83245195455.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c543851f1---meponubiwemulalisimid.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/48950527074.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d70950911---66069762536.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fuwebazawefikikumudus.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/68030662363.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/bipojipobunapu.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/1852058569.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3caf9c690a---rijelefetojefiwamara.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c40655230---75985696074.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/77475534752.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/zevod.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/edc1653a846278cf88297e04fa4799cf/94822005704.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd042f388df---10266157686.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058a50a567c---45990405657.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/10432954995.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bce6a91b73a6e7a13b735c56f155f12c/58327954780.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83108eca4---pegato.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084159c0c58d---zelir.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/kadetubukobowukipasilesap.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/tagapizasakif.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160779d3b13fcc---39834551024.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ejbc654vdvt4g6u98k3dcidd0/niwodavirufuvepejimofazes.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/9131303973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solving+logarithmic+and+exponential+equations+coloring+sheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 20768 bytes
SHA-256: 744b7415edd55e5905146fadca6fda1e5d6868a4c46e2220bf77294fe8da2b19

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