Malicious PDF — malware analysis report

Static analysis result for SHA-256 839dccd6fe0d15b7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 01:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 205ba7a2dfb8537cee58aacf87408d5d SHA-1: 3f335be4645eaad433cbc02d52d734645029861a SHA-256: 839dccd6fe0d15b76f08635f7281c69ab3337e0a5b773ea1c025dcfa9dea5361
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/833c218338e416125c8f8cbcdccde3cc/wibol.pdf In PDF document text
    • http://bestbelly.org/content/files/files/67353505539.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c5a13689---31400956360.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/tatumumadevegiwonazetofel.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/nagaledotugir.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/67fa5c0df030d840ed33101679802692/rajuxegalubevugonolevifom.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/bikomibolukowe.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/najoxafemufebobe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609274af121f1---manurif.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ba7b8fc---98047281585.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfd41b88c---dofosazaraxid.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/50988661684.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624357615.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41f70586f---jukubipize.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095234bc1a39---708148922.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/34855787853.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/561dc263b559aacf5ca638be5a0f2844/67814113706.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783152761fd---tajufefaminomejaju.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160829b1f2da60---21600405765.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/ladusifir.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608256035aacc---2739953284.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54906324538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=goblin+slayer+volume+8+pdf+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xonowazapifixuweminovales.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 11312 bytes
SHA-256: 8582f24963ebf5e764378357853e598a6b3b83de6bbe55fffad19368a66411de
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 18184 bytes
SHA-256: 931a91959a5fd3d17d708eb12066b92e94cc4b57fb7c654ccb94878a2187478a
font_02_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.