Malicious PDF — malware analysis report

Static analysis result for SHA-256 255db5124a2ccdbf…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55966dffc9016a9232ae2812726e7f17 SHA-1: 880d5620b899a239b5f7a5ec9440f7caa8a2cf99 SHA-256: 255db5124a2ccdbf26cf07a35b120396512d6f3631217c720697f44c17884b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan. The primary attack pattern involves luring users through a malicious document to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6d75a7bf---wakowipi.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9d1e90c3d2513451d0f473e6636c3a00/8651373765.pdf
    • http://qzgj.cn/upload/file/diref.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/834cj2s51odp3nps50lfmi4g55/zoruxarukaruwumepip.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9cad833220925d633d8c7614db85a41a/71838389766.pdf
    • http://18554080.com/userfiles/file/radixulitisinasazupap.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092947ee42c2---nunatobojoterugazawe.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/zifipovesugogov.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38111a5744---38200418375.pdf
    • http://poexali.org/static/image/_u/system/files/megemezerano.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c65b0923---94144393446.pdf
    • http://kovacsoltvaskerites.hu/images/file/wajaginemojek.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75fft47gr3jcbbchqdng1pj644/giselometoled.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/215e632b0660571df95058d42c765340/nedeluwenakomaforasoral.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ac2b59643---71056171584.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/rumokenatulawoxadi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f0485c7d2a1eac329aa401d8efc883cb/sipupajufevekogematojimu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609405bb00179---95068423999.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9081400846403cc35a48279bcc959430/tilewudaduzovizob.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6818e2476833585f24cf1ca5b490b9e9/30956366595.pdf
    • http://naturallabs.de/userfiles/file/najavenekawosedezowexet.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc15a842bd---5192470098.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7dc4db96---21905386934.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098743157f42---xenevetefejijapape.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+find+the+equation+of+a+line+in+slope+intercept+form+with+two+points
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f672.bin
8ed55d6ef06541307f6975a2c9d3adb5ed9fcce5c6d6c553ad58a2f7fa16f7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 17276 bytes
font_01_sfnt_off00012363.bin
8428f008d93b72a91244e8f8466342b58d317727c5d8b196e0c5e33ea192ffde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 11208 bytes
font_02_sfnt_off00013d37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 16792 bytes

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