Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de8b42f8e7291e0…

MALICIOUS

PDF

101.9 KB Created: 2021-07-07 08:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2155e4da7f023f174ee6a4b78f38e606 SHA-1: 4547caf17316975f87dde5f8eae9314465c5cef5 SHA-256: 8de8b42f8e7291e0398394e5052789896ea427fc1447260b8e6701c03253289f
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://aihyang.com/userfiles/file/jaroxinexejujore.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/notativoxevisif.pdf
    • https://bloomland.com/sites/bloomland.com/files/50891836683.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d526c1a255c00ebb9863c5e418e07a85/papewawapolilajabexoxez.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9883b278---7134085298.pdf
    • http://szakkepzosiklos.hu/upload/file/dipidumenigetetimatala.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/31124203512.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb38e4da0e---20861704495.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bc58c392---vabudasukinudi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d23f2f2087f55ee0869ea2e0c0fab3da/somezafales.pdf
    • http://studiopignotti.it/userfiles/files/41803282362.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f6edc3ff---57010697466.pdf
    • http://abwplazaview.com/uploads/files/xajagiz.pdf
    • https://lescourailleurs.com/upload/editor/file/6224574483.pdf
    • http://decaldankinh.net/upload/files/bawafijezojeka.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0b3ab8bb7---71339066877.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315d317e1a---sizerajusu.pdf
    • http://inglewoodreunion.com/clients/68690/File/jeleruv.pdf
    • https://noddy.nu/images/file/85575810549.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff0fc7803---bewasu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/69852f1bcdfa4c0eb0cfa830a6637356/somilenareziwezodi.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddf94c2b78663418dc508a6ebe4ea781/tanarosotogatuzilutagejuj.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d805a278b10---gizusixozi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c766476914---vafijejopiwu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/741b1b98beedc3ef1b89d1fa8271fe2d/97629448802.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kingroot+apk+2020+android+9
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
font_01_sfnt_off000132e1.bin
60750f0ddadbe325fd82addf7004fbe7cdd6746d12f87cc5637a7c0e4699bdc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 10716 bytes
font_02_sfnt_off00014b5e.bin
5d99a41e46f3a7c2d3a6bd64b00198a039ee72a329d1b44167a5802159863039
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5E 24312 bytes