Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfca64acacb0fe9…

MALICIOUS

PDF

79.3 KB Created: 2021-07-18 19:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffc0e58141ad81f22d8fc4761e159695 SHA-1: c23a82385c3453a2bbdda43c5412a3c42982f30a SHA-256: edfca64acacb0fe9d623ad25380e7c393b2cc91aeca03f4331364f6fbe6813d7
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 a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or download further payloads. The PDF's structure and the nature of the embedded links indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ats-dz.com/userfiles/file/11979738947.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77890712436.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b0c5213d6---dobuwovelifakigunarujosa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qt0q4drjc0o2s6iq6j7s68td3/vazaw.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620289744.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab9a7914c---30117372310.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/sujikuseko.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/getonukofa.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/36948173768.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef69f21beb---70009814553.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/lefowalikaxuguwamizere.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6611fb8a246d618df9c5b8a21050909e/gepelagofad.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/52104736669.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f99ecfc42---44127885709.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/63042505881.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f9cbec1ce6e24ed5e546f8c584c49ec4/9021650123.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jefamivisam.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607541cc35d71---3024816188.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/15591980518.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/47801491308.pdfIn PDF document text
    • https://webmenuplus.com/images/file/35522323513.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-21/20210521210505162497.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/utldr6bls4ahqfksd5mj3nmdkc/waxokilixezoki.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/14325605465.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/kiradimasare.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801277f26b8---wifovaxopimezobobeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=drift+hunters+unblocked+top+speedPDF 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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 10888 bytes
SHA-256: 3c321cabf788a953d29942e8f545296bef60cd7bbeb6ee1c720638391d40cbdb
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 17384 bytes
SHA-256: f7ba56d15488e40454140c40a18c9bb3c670f9db7e407d55098f982f655bb20e
font_02_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1