Malicious PDF — malware analysis report

Static analysis result for SHA-256 72940d1b7105bba8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c5fb405b1395e071bdef1260e531088 SHA-1: 79a496de47853e9b5c5441e9a09e89d0303696d1 SHA-256: 72940d1b7105bba818d134f72f21ef99757a1996d2628ef6e3c9f87321bd59eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, as these rules often flag documents used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://iworking.vn/uploads/files/58892939034.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a354d4ca82---75075859388.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085563ae7a7d---99442401813.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mj9hbs7u0nesq1mr4g6bshk943/gavosenativowupatisodu.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/kegumowi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/98446948506.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/bibugizuletujujiki.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/18147046927.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/xuririjurodikafazakizus.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wuvuponinotowajizisumiruj.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286b14b7712---10755934408.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210803004608321.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efad47f8aa---tagitenojob.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/63182936831.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/sunupebavexejawor.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc10120681---38186819015.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7741d33eb---mutapefajaxiruduf.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pr0eltrhjt7jmlpb59ns3mhgr1/53202573589.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/91219942053.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cb196a7ad654645c1694f872877bb815/jidotav.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/72938916478.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/557ocm2301retir18lfs3uslho/fipozofupodutekivobeva.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/79073839695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=english+grammar+in+use+supplementary+exercises+2019+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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 11708 bytes
SHA-256: 0798db32a4153567f20e34b8105da374fe462098e9dbe5d471ccb7e110a9e2ec
font_01_sfnt_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 17012 bytes
SHA-256: c8d3f7c56b4661f8ec0bbd603e8673479db723f0de4200dd068b63c6b0d28779
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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