Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e6a4aa4140e26a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 19:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73c463e2829db1bc717ba7c17f44fbe3 SHA-1: f469cd93828662eef3f18ee0951ad2c2aa48fc8d SHA-256: a6e6a4aa4140e26ae0db178485d7c2566b291896941a535bd603ccfa868999df
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs suggest an attempt to manipulate search engine results or direct traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8084155435---34611580841.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/fojuwejuwazokopibaxigo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e13691e6267---luzajapivewedum.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7ba659a5483d67ce2bb10fc2a16a17c9/noxezusitefojitejused.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/652bc49d3455f562ecb3fb1305576eaf/titetagevaguxin.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/27d44042e495405ff043e1944301ee7c/18164064712.pdfIn PDF document text
    • http://zeci.nl/im/image/66767122060.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072194b9809a---97939724679.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/xuniriluvelarigazoxibu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c35d96786---bufisife.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/10715063868.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/vasuxixedomawokumabaled.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/12957426009.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ee221c16d6860837eae9c014fc6f0070/23658748162.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/39742918257.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/patagejobuviji.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b5d3a174a---18104494845.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gemadajezoremulowutose.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c7a960dcee9---91007563300.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/98356047935.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96d9240ea2bd9ad519bcd0537dbebd5f/pujagosutugativevatalo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8678bcf---vorujotononopiwakike.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/81534206377.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420707a6d0---bededavinerunikaxujajub.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0b2194cf---muzurukim.pdfIn PDF document text
    • http://prestopc.it/upload/file/90354543879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=electoral+roll+pdf+upPDF 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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10332 bytes
SHA-256: d2145977d241b9920f0228edb64d193121b1bfe9499cb8b21c14f10b708572c2
font_01_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 17948 bytes
SHA-256: 96d325e322bfdd23a450410670306811265f9bb0d1ab7e739e579abd1bd2820b