Malicious PDF — malware analysis report

Static analysis result for SHA-256 891d34949e695aa4…

MALICIOUS

PDF

73.5 KB Created: 2021-08-19 09:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1153175c14c4637a6e0e5654048e46ac SHA-1: 834033d813d8330e3b3bc0354c663613afe26448 SHA-256: 891d34949e695aa4a42a35b488030f0963aec640805ae402c97a12f066600040
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious sites, leveraging SEO techniques or hosting further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://j1medical.com/uploaded/file/vetagilobogaludutizageb.pdf In PDF document text
    • http://mispuntossaga.com/campannas/file/4302722751.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/82377591346.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/43398828949.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/5407552541.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cb2l89to3nehqootrbg7enm7nh/zidevujopozupapile.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24e97d76b5---kejunulisikidonijaz.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/64220663808.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a1b4dd5a---badegozirisi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/53776431789.pdfIn PDF document text
    • http://capri.lt/userfiles/files/winavonosugebesabupuxadu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/riramitalexi.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/64535721655.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/78677355934.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/gojukutosaze.pdfIn PDF document text
    • http://ilkemymm.com/image/files/fimenojebonupewujomarul.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zedalaloxeraxulesobelod.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/96483165955.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/boxibatix.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073702e0d21e---mulajeri.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/79s22udr0hj938btm2ahkrggq3/kodowabegajakegekukokip.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/98671447503.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dosokesubejunujutosanover.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/rubid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=analyzing+and+interpreting+scientific+data+pogil+keyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 16936 bytes
SHA-256: 812e75d830dbbd315d97b4566e8511e72643f3c48f3ed3bef6ee30690c3e3ee8
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 11044 bytes
SHA-256: 5b7cdb5bf38c37828c07a02dcf685b58ec158c9a87dd23c0b7c1f09cd8948ff9
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1