Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c21d0643830466…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 08:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17a957284c3c44397763419488430fc1 SHA-1: c44c66f29e14ed8bf357c7cb634f6135c4bba264 SHA-256: 62c21d0643830466c4141ff9f6b5999bce75f165e9e4aab308a2c1f3d7ffd519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://petribax.com/userfiles/file/wipopalimabodovepotoka.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/4847096615.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/46593924857.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/laxujijew.pdfIn PDF document text
    • https://kokomanis.com/contents/files/tenexuzagaladamupaderonur.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/14400248175.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430437c9369---nigijil.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/fijevadogegume.pdfIn PDF document text
    • http://floramarble.com/uploads/35106729253.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/36043843397.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/80923382826.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613536efa044e---34519843558.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/28347835018.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/72395133116.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/jejelabajibipekifoj.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/movunitatofenunimodi.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/18626008003.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/kevaworukaxejerasiginu.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43337021217.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96709250066.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/vikobamaxasulalinus.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161419aee2c004---merivujolag.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/74548630883.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/19796721816.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f578105fa---porikipipivu.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/lanofixadagik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=screen+recorder+android+snapchatPDF 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_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 10640 bytes
SHA-256: 55bd0a0ee6637479cbe4652a256858129898db6ba583c96d9e1e37c151a9282c
font_02_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16964 bytes
SHA-256: cb727ea9137eb181052cba494bddaf438e0ec4025a865189dc1893c038a909fe