Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3137b75a8c86eb…

MALICIOUS

PDF

75.6 KB Created: 2021-07-06 02:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dd3f47e269de4859c38773a52a98f358 SHA-1: ad2163a5fc59650ed6ba86149df3e1a20a1dc8c1 SHA-256: 5a3137b75a8c86eb892ca40e85948d34715e959ecd3a00afd18102dbe2031e33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=colonial+heights+library PDF link annotation
    • http://zkojicin.cz/userfiles/file/kagusibugokufutatokamexaw.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c6eab93be3875e81550fcb3a9d30bcd8/safipanilenukitis.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kavujidubimugipugivarax.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e4178c82e2accd579f838af2f232fa52/vikosivili.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6vo9duvmvagk3ntbb6amv85gsu/5731012332.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/detitilojax.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/58545404477.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/velanifif.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4aba899749c27e83a76eef455895357a/wilirixowopodatifeguwatik.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/robusoxixumoxenoxuluvon.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/87add5066c45bdb0da2e9d54b3ff2e0b/54313125418.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f0c1be688ee2af98343ac08916b7f781/jamulejazinani.pdfIn PDF document text
    • http://kotolantopeni.cz/file/5481522722.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pupikisis.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/26984580021.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/soxexibepugod.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/xinobixevukufas.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002079dd64---68380708809.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcca80d978---tixenawusodamixuwa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/wuxegusemo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa131500d6---sakapaviwutafiporovige.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5f495537---17873583011.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607356b728419---musivujaxa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 10672 bytes
SHA-256: 25b2291f512a83775825e6eed91365ea129e662f02cb693e25eef3f8d8ab620a
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16596 bytes
SHA-256: 4d8a72ed83ea5f9caecccd9ff9025878b0b643e388be00998fcdd9857a9bd378

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