Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9127f3cbf1bd5a…

MALICIOUS

PDF

96.6 KB Created: 2021-07-01 10:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 16cac21229f8ec56523283a618fa3435 SHA-1: ab5a5725c534b7eb1f6e77e7109917573b429937 SHA-256: 0a9127f3cbf1bd5aec5882df118f9769cd4a8bbdca33547da16201c4d24ab66a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting domains. The presence of these links suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • 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 http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/wukegerelidurilipudodivo.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8d6d5649---95198586034.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c495499e9b8---gilurewogumujujopavodu.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/waweroxasekamon.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/46626706385.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc04a9dea8---17953041337.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fcad56bf---jokan.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/rk22i48m0t9vroerau6hbqs0p3/3019802743.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/49596064047.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/52496802217.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/m8cep9cocpltlru9rk82u8756k/45181367793.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607134e9dfd66---46266555575.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/923865341.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/puxajajotafovakop.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gis26rbsvhv2kpverq41893tc0/22969625332.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a2837567---9331773178.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9e81cdf7de0b44daf15230800cf8aa28/zulumojalemo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/15m02q9v7qm9dcj37epnbvqap5/peluloxutox.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7b6672a24450877827b9b54b04d9367a/funabivonaxotaf.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hqm4igkfpshvr7sd4kv3k36j37/bemilemusenovazevobixetof.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b351c4be---diporujarupugoxufekutuf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/66670193470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=prime+minister+youth+loan+scheme+2020+form+free+downloadPDF 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
stream_004_off00012e44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E44 24848 bytes
SHA-256: 0030ff77988052620ad958f168e633c0227be927b4f9c8ffb780552c5da1cc7c
font_00_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 17348 bytes
SHA-256: 8fd4627ed25861ae6828a3f1fae86e5a2a51f82dcf06734698cd84e0ef479eb5
font_03_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 11284 bytes
SHA-256: 42418da98bce4d4590c6fcd75cb8fbb71ec293a2938cd5f14a13b5d54e678c52

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