Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace464ebe0192702…

MALICIOUS

PDF

127.6 KB Created: 2021-07-13 15:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c6a862b59f4b48331170bf171a932b5 SHA-1: a9620dbd21424eff0bc7c2147754f092ef272978 SHA-256: ace464ebe0192702fe381cf3709b3ff6db9bf2ff49ad9d23f4336317a2ca01cb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/67ebd5cd1cfa265455bec4358283f78b/6433522190.pdf In PDF document text
    • https://tsegypt.com/file/7743598732.pdfIn PDF document text
    • http://bienbao.net/uploads/files/kuvefuwibukinanelezujuda.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/dopokawedu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/01161ae959adc43ff2e5781ee543b679/xirazuvenewebebi.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/kunojalanuworodote.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/dofabazazap.pdfIn PDF document text
    • https://bselink.com/userfiles/file/94876624032.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac879c962bb---xopasomegudixuwot.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c8a63b722654cac47400661f67f1a8a3/saxipumopobibojagodabeguf.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/wisujusu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccf2da6f4---fajiviriwafevidesujina.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb99abd091---larabazitinonudekararexo.pdfIn PDF document text
    • https://wrd13.com/force/file/2677640721.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7idnsk82tn8d9j4468fu7cao4/kijuzadesir.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/27112548804.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/magitisejuguwageti.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/bidipafi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c926fb02d76---30620053741.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/imv4n1pk40h5d92f7u4g1uve53/85814256304.pdfIn PDF document text
    • https://tangente-mag.com/img/file/75107907623.pdfIn PDF document text
    • https://belloverde.net/emailer/file/78076945262.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d36f438f66d---tizobuneloramu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=enthalpy+of+a+systemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBF 22484 bytes
SHA-256: 9d96bc2d9d219c2f99ca78c6ac02639ead0c55216e2faf891dd969e2d02da96e
font_01_sfnt_off0001aadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADC 16248 bytes
SHA-256: eec42f0bba4018f6ae412dee0b30f2e8f62d2964327a9edc906b3dc49daea092
font_02_sfnt_off0001c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8DE 10528 bytes
SHA-256: c4649ea385ca26ac567b89a2ba9fefbffa453ce1f9e28398cc592631934eefc2

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