Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a15b198c5b739cb…

MALICIOUS

PDF

94.4 KB Created: 2021-06-26 19:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70230ba0ab9595a5a2de970f9ea21330 SHA-1: 6e7a83d72c3629886ed610f1cf0b15948cc0b272 SHA-256: 9a15b198c5b739cb66d5f9bf229ba47ae59113d39af64837de71c21d58604995
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=a+friend+in+need+is+a+friend+in+need+meaning PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7fa31f95---popazuzikafovepasezalalat.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/73788564325.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/tozudo.pdfIn PDF document text
    • http://bdn10.cz/files/file/37458600857.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/44a8fe3ea41a42b6f043d341f10d518e/28473038133.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/fomujedisarix.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/21626859631.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/tevubugelugakebaba.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd80875d43---gipulusejatezuzoko.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/29070793421.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/gugedimojuvisudupe.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/sivogewu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/5a497a9e9aa823bde36361549a640394/lemubefurinofafixemenovaw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/0kflo5mft7h1c6s64nr7t7ab0n/78734264700.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/or57cao8suonlkvd3ha51ial26/57194016534.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f342dba07---rozit.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec2b01bdd---24217836141.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185835e0b4---sopikesulopavuvopomefu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/voa4d0v63k0s0od3qr3f5ts3n7/duwopuzanerifuza.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k1fqfnp24uagiksa04pbkfgd86/64726150144.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/t3e09gnfvs2gealb2bpvhjjd4l/ninusagakotagov.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/todiliferuseba.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6kgsookc8ko43g248mq65s9n86/3627035197.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_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 10412 bytes
SHA-256: b1053624ab210137818449e8f23bf05c3c65cfec532af340ea9e28af6920ab01
font_01_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 17300 bytes
SHA-256: c7e4e7f9c3ee66082e4c778d756016e48ecd6491c91555c108ba9e72e2148ac0