Malicious PDF — malware analysis report

Static analysis result for SHA-256 5162efe67c725739…

MALICIOUS

PDF

101.5 KB Created: 2021-09-05 14:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4783d04ee42117881c795a9d2591c66e SHA-1: bb6a8ab8fca539b90ad2d08aec54d5f7098f9864 SHA-256: 5162efe67c725739af89a32d73e3fe3efce9fc9ef8c6e6be55c27530e6488130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://apskarota.org/userfiles/file/juxigejogadojunokifadis.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732c786a872---ferajazo.pdf
    • https://destockbaby.com/ckfinder/userfiles/files/lepugalakukowu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4f714b6d---1746651489.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f76434e402a1e765a03910ccddddc25a/69265580845.pdf
    • http://ros-grad.ru/fck_editor_files/files/38213052806.pdf
    • https://gifarlcm.com/upfiles/editor/files/31132315434.pdf
    • http://dachastyle.com/userfiles/file/50571766645.pdf
    • http://honghuibio.com/d/files/57904931426.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b2067f3b8cea5404a33f252bf1b898e4/xutamilikisazozolumi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6607a83a9---zazapatajok.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/82882928194.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/jusoredo.pdf
    • http://myshopgroup.com/userfiles/files/6574478858.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/18298177233.pdf
    • http://hiredriver.com/uploads/assets/files/29760543938.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04dc082dc---vimevawinufesap.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fd44e8e0a1e33be347fc98f1d7fe608d/12123268240.pdf
    • http://romanakladatelstvi.cz/userfiles/file/bagise.pdf
    • http://detikakdeti.ru/img/file/viwifufizasawaserumenov.pdf
    • http://morgancountyoh.com/userimages/pijugukopinukibiva.pdf
    • http://snypes.nl/img/customer//files/jojugibifopawesipuxaxele.pdf
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/zuzuf.pdf
    • http://lab4050.com/upload/editor/file/8318298118.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afc0a55c1---fijiwutukajinekadodadefon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=systematic+review+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012218.bin
94ab04ebe3a80377fae9eb3a5f6548ce33d6b91a68fbcfbea5696a0ba7b8a4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 20220 bytes
font_01_sfnt_off000156f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156F0 16792 bytes
font_02_sfnt_off00016f07.bin
c7618e3652438008bc892ddf4ef9aea81e1b0da5f4ff5902fcb8499955fa6dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F07 10852 bytes