Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aefad442c67d3f6…

MALICIOUS

PDF

94.7 KB Created: 2021-06-30 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bea13b15ee4d1812daf3090976a285ee SHA-1: fe0efea1ba855a7ace04e4e579e1b94d999c061d SHA-256: 8aefad442c67d3f6706b7153b2d88ca186005710c1738af6f58c833d2e8c1e17
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to host or redirect to malicious content. The presence of a 'download button' lure and callback phishing pretext further supports a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stmarys-perthamboy.com/upload/File/66789202478.pdf In PDF document text
    • http://hzdsbg.com/uploadfile/1623584909.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796322479d6---dovutome.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/61653884732.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/82487643063.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1d93397bf---72961669880.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b928a2121ba58812f0ce56f28f7ab85a/44873176667.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/guvelexenafejab.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8741d3adb0243c296eccdafc544638a/nufepatalimekobesopomip.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/pegebefumedow.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/sozikeragirapobobesud.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/wofavimof.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3db3624e00dadc534c591dabc9bec61d/40267159519.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lesironewajesamuk.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a304bd8cc27---nedokumufos.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37ebdd002---49656151999.pdfIn PDF document text
    • https://amblamy.ee/upload/file/5747962146.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/26622133196.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/10628683958.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561e66095ea3ccd4ca24e03121a25537/mubavoro.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c413f69adb8---23822199284.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f2o5faoiaalrie6eupfl94f3k8/gigomotixadumasiguxeda.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///35006862593.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/zuvasewezipezukom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dominic%27s+pizza+and+pastaPDF 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_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 21652 bytes
SHA-256: be8a46a59de798b92189a6950c24e42d842676738bd7746f08e862515c8c66d9
font_01_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15416 10492 bytes
SHA-256: 43d6726354752b5bf36f79ece071183418c8cb329844f397c4bcfbf92ab42874