Malicious PDF — malware analysis report

Static analysis result for SHA-256 0720de87812c38a0…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: abfc6398456b962d389553e9f8031a43 SHA-1: 1c48b7a4cae8f2499fe335e0537ebd5eb7c78fe9 SHA-256: 0720de87812c38a0650015240bbb0fe0794022dbddc2d178baec2edf95c7b990
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thuaphatlaihanoi.net/uploads/files/lawopenomifo.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/wepivelutowolexipet.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/pabatafaxe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3208cca1---jaluzokopuxu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3559f9621835c2b8853b14d6b84dc9c4/xawiwozoxawutefi.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/29768020804.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/segawidaxorud.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/rebim.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a18b96737---60521491918.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/zutanitolunitigifinud.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/88106697036.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zasuzeravi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/25762646938.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c55e5e8fa---28466499971.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/45225916802.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3baea04a87f438f5382d699d36c2a4db/xexux.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49bcdd7379---gogofekajarunam.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/ramumidotan.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/002929d63de0235cb60ee0af52342486/26341166158.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/vawigidawuzejoxagitub.pdfIn PDF document text
    • https://paperland.bg/uploads/file/93422480931.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b5e7e7af---jevuwene.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3ce9424d---1912267767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=persona+exam+answersPDF link annotation
    • http://medlab.webd.pl/upload/file/92470216070.pdfIn PDF document text
    • 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 17128 bytes
SHA-256: ec5c3acd9d82db24d28d539aaf03de28a533f1a170e34dd5097b02dcd5057fcd
font_02_sfnt_off000135cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 10224 bytes
SHA-256: bcafc9af74e6cf00f69eea41486e0dcf30a590996f59626241f5695f77f5d71b

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