Malicious PDF — malware analysis report

Static analysis result for SHA-256 7038dc99a683004c…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 54b71a5959ebbfb0cb9447eac2ec67ca SHA-1: ab451ed143dc362d96c96a6953ef4d690f6a4197 SHA-256: 7038dc99a683004c3ef6b498e8e4204bc14c4f8268cefa38888ce89cef95d018
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Numerous heuristics identified embedded URLs, including links to compromised CMS uploads and raw IP addresses, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the PDF's structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amthanhanhsangchinhhang.vn/upload/files/97832142564.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/79784028604.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/37722633069.pdfIn PDF document text
    • https://istanajp2.com/contents//files/15433140083.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c23e42848---44341322430.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/tazezuvelexorubunapibob.pdfIn PDF document text
    • http://wenxuezj.com/images/File/32191188609.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/toponafonunijavelisekoka.pdfIn PDF document text
    • https://negaratoto.com/contents//files/6121173680.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e11b1f31a2d---87422079757.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/xuxajuxuxozep.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a0daae51d8fdc0ce7ff771a0550c641d/mafajutitipizik.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zekatasetonekafuzit.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/mezedirigexo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/147564838b46b73617b510f082490478/42785353107.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/189508341.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f284b9c55---95198549354.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c27da000c---51762406892.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcda10d227---vitetifakomotixadel.pdfPDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff723c5cc0---28149841406.pdfIn PDF document text
    • http://stromzeleny.cz/file/63659272118.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rgf5s3s20iv4favnqgok13ce10/xinixewuwofofo.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/doxusibebenawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=certificato+anamnestico+rinnovo+porto+d%27armi+modulo+pdfPDF 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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 11012 bytes
SHA-256: fb0486feec0c4fc136cc885a688d945b4e7f62222bd3cd78e72e7b91b28f3819
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 17372 bytes
SHA-256: 86a287dc6f23c34a47a3b0f9f756064051596a1413091e5aab026b77212f6561
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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