Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c138183464e20…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 03:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 239735decd84963e6fe1e9cbb4893535 SHA-1: dcc4128c05f705e7ea09b77e2513701c9f95e1d1 SHA-256: a80c138183464e20cfd49255b6f5ecb95495985101b7ece3290f976d1e48f3e8
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or use IP addresses directly. This suggests the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407367e2efb---61812639226.pdf In PDF document text
    • http://sadiqandsons.com/userfiles/files/22062355954.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/86651784598.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/10703171133.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/jajokaredirime.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/76641250018.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/vezovexaj.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/35780041146.pdfIn PDF document text
    • https://path.mn/userfiles/files/pomazupo.pdfIn PDF document text
    • http://cartopack.be/Images/file/57569912929.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210911_034454_114.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/54243312436.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/77611506378.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/gurisinusonopoxoxuzofuvi.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/87784654575.pdfPDF link annotation
    • http://recviem.ru/img/upload/25700911577.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902215913.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a2d569b61397e53f4b618fb8fa314c1f/51230214253.pdfIn PDF document text
    • http://dominant.name/userfiles/file/92456662760.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/23325209268.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210903_D917C71C72EDA2CA.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wavatubipolenubuk.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915123430.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/fivamipepabudegatitawovi.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/sajizelaxogoxitaxisokabi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf501e444---xaverero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+moment+to+remember+english+subtitlesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 21584 bytes
SHA-256: d917cecf5e44f283ddca0e4c6574b0e6aaead782b2bd28b6110531a870a56895
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10616 bytes
SHA-256: 4217a8f7620f35d37e3f9b0afd826e67b1450828206eb85a9bf93cfd628882dd
font_02_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_03_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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