Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9aa87b3e122b13…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 08:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 58a7ca7d20593495779b36805a48c662 SHA-1: 17ea7719cde087c90ce0cd05cf574d05c233751a SHA-256: 3d9aa87b3e122b13bf405cbfc536e870aca00b53bb3c70f3e4bf5101e9ea544d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm potentially hosted on compromised CMS infrastructure. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to lead users to malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a24a5c5765552a4451d070c456280be7/livuvefipezomabogoze.pdf In PDF document text
    • http://lesen-und-schenken.de/userfiles/files/72003798044.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/salufusuxo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zozalenolizukat.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8cf7189de5e94e9e01389a139245dae3/10867602002.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/wugobatepopipewokur.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/u1ssdsa2oevge2so5e6ubi7eu3/47985383035.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/987f67210b5a622da902cce2b9d58ea9/jigamupaxowotujisewepesaj.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160846c7b6e747---25199865124.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780006ceeb---78634309097.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210517030823.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078604a6efed---gilodag.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/36928873192.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/9fbc20a9479361bd9706fcf3904834ad/magomupulotula.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee7b7c1c95923804841de5c41061dc8e/wukofanexoroxejajub.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607384df4c03f---59353339496.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/25549110627.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wabixa.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/44512043901.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/45254206954.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12d92d6e0---zutegowefemugulo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nrtnt24jjpdo94h4d8pfelah43/67629933628.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/fakuwoti.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a109547de7b---32916931511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=outbound+telemarketing+companiesPDF 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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 17436 bytes
SHA-256: 6615725d88c14910a59dae2a1be81aa7258cb6741effa5408547608c501d2151
font_03_sfnt_off000148e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E6 11216 bytes
SHA-256: 4768c2a7f04e58daa84608de6111dc93180b2308a830b9b2f96cb778c9eb1b11

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